Audi A6 C7

EA189 derivative (105 PS) in the A4 B8. All EA189 vehicles are affected by the VW diesel emissions scandal and received the mandatory software update. The update triggered EGR issues in some cases. Main weak points: EGR valve, water pump, and DPF with short-trip use.

• !! Injector failures after EA189 software update from 130,000 km

  After the emissions-scandal software update, injector failures on the EA189 increased. Multiple injectors are often affected in succession. Costly damage.

  Symptoms: Rough engine, misfires on individual cylinders, engine warning light, heavy judder on acceleration, increased fuel consumption.
  800–2,500 $
  Ad fuel injector 2.0 TDI EA189fuel injector 03L 130 277
• !! Oil Pressure Drop at Hot Idle — Bearing Damage from 150,000 km

  The CGLC 2.0 TDI 177 hp shows critically low oil pressure at hot idle (>100°C oil temperature). Bearing clearances in the cylinder head are the root cause. Below 0.8 bar at idle, bearing damage is imminent.

  Symptoms: Oil pressure warning at hot idle, red oil pressure warning symbol, engine noises at low rpm.
  2,000–8,000 $
  Ad oil pump CGLC 2.0 TDI 177PSHauptlager CGLC Audi Q5Öldruckventil 2.0 TDI CGLC
• !! EGR valve coked and blocked from 120,000 km

  EA189 EGR valve carbons up from soot deposits, especially with short trips. Complete unit including cooler often needs replacing. Cost €700–1,281.

  Symptoms: Engine warning light, power loss, judder on pull-away, increased fuel consumption, occasional limp mode.
  300–1,300 $
  Ad EGR valve EA189 2.0 TDIEGR valve 03L 131 501

+ 3 more engine weaknesses + vehicle weaknesses

EA288 with 130 kW. Further development of the 2.0 TDI after facelift with improved emissions treatment. Reliable everyday diesel.

• !! Water pump failure — up to September 2014 from 60,000 km

  EA288 engines (CMGB) produced up to September 2014 show known water pump defects (TPI 2041955). Temperature rises to 130°C; engine protection shutdown is possible.

  Symptoms: Coolant temperature in the red zone, coolant warning light, vehicle enters protection shutdown.
  400–1,200 $
  Ad water pump CMGB EA288coolant pump 2.0 TDI EA288 A4 B9water pump TPI 2041955 Audi
• !! EGR valve and intake system coked up from 120,000 km

  The EA288 TDI is prone to heavy coking in the EGR area and intake system, especially with short-trip use. The 23x6 software update activates EGR even under full load, which accelerates the process.

  Symptoms: Juddering in the lower rpm range, rough idle during warm-up, power loss and increased consumption
  300–1,100 $
  Ad EGR valve EA288EGR-radiator 2.0 TDI A304L131501
• !! Particulate filter clogging from short trips from 100,000 km

  The EA288 diesel particulate filter cannot fully regenerate with predominantly short-trip use and clogs. A well-known problem on urban vehicles with low average speeds.

  Symptoms: DPF warning light, power loss from exhaust back-pressure, engine management enters limp mode
  800–2,500 $
  Ad particulate filter EA288 2.0 TDIDPF A3 8V Q204L131722

+ 3 more engine weaknesses + vehicle weaknesses

EA288 with 140 kW ultra variant. Optimised for low consumption with good power delivery. Proven long-distance engine.

• !! Camshaft Fracture from Material Defect from 120,000 km

  On the 3.0 TDI EA897 (CRT, CUE, CVM variants 272 hp), a material defect causes the camshaft to snap without warning. Affects Audi A4/A6/A7/Q7 from 2014–2017.

  Symptoms: Ticking/knocking clearly above normal diesel noise, power drop, engine protection shutdown.
  3,500–20,000 $
  Ad camshaft 3.0 TDI CLAA 272hpcamshaft CSUB Audi A6 C7camshaft 3.0 TDI EA897
• !! EGR System and Intake Tract Coked Up from 130,000 km

  The 2.0 TDI EA288 in A4 and A5 shows coking in the EGR system and intake tract at higher mileages. Urban traffic and frequent short trips noticeably accelerate the process.

  Symptoms: Stumbling and hesitation in the lower rpm range, rough idle, slight power loss and increased fuel consumption
  300–1,100 $
  Ad EGR valve 2.0 TDI EA288 A4throttle body CSUB04L131501
• !! Particulate Filter Clogged by Short-Trip Use from 120,000 km

  The DPF on the EA288 cannot fully regenerate with predominantly urban and short-trip use. Regular motorway driving is essential for self-cleaning.

  Symptoms: DPF warning light, engine power loss, increased fuel consumption, possible limp mode
  800–2,500 $
  Ad particulate filter 2.0 TDI EA288 A4 A5DPF CSUB04L131722

+ 2 more engine weaknesses + vehicle weaknesses

Proven V6 diesel with 150 kW. Smooth-running six-cylinder with good pulling power. Timing chain instead of cam belt, therefore less maintenance-intensive in the valvetrain.

• !! Timing Chain Rattle on Cold Start from 150,000 km

  Chain tensioners lose oil pressure on cold start; chain slaps until pressure builds. If elongated, chain skip with engine damage is possible. Older production years with four chains are significantly more susceptible.

  Symptoms: Metallic rattling or clattering from the engine bay directly after cold start, disappears within a few seconds
  2,500–3,500 $
  Ad timing chain 3.0 TDIchain tensioner CDUCEA897 timing chain
• !! Camshaft Material Defect (272 hp Variants) from 80,000 km

  Material defect in camshafts of the CRT variant (272 hp) causes tooth flank wear before 100,000 km. Knocking engine noises, in worst case engine damage.

  Symptoms: Ticking or knocking engine noises clearly beyond normal diesel clatter
  3,500–5,000 $
  Ad camshaft 3.0 TDI CRTEA897 camshaft
• !! Turbocharger Oil Loss / Leaking Oil Lines from 130,000 km

  Oil lines below the turbocharger develop leaks. Oil consumption rises gradually, blue smoke from the exhaust. Complex repair as the gearbox and turbocharger must be removed.

  Symptoms: Blue smoke from exhaust, dropping oil level, power loss, whistling under load
  1,200–2,500 $
  Ad turbocharger 3.0 TDI CDUCÖlleitung turbocharger EA897

+ 2 more engine weaknesses + vehicle weaknesses

V6 diesel with 180 kW. Best-selling engine in the A6 C7. Effortless performance for heavy saloons and estates; excellent long-distance engine.

• !! Camshaft fracture — material defect from 100,000 km

  In the 3.0 TDI CLAA (204 hp) the camshaft can break due to a material defect, causing immediate engine damage. Audi documented the issue in TPI 2043172. Affected production years 2015–2017. Camshafts were sometimes replaced free of charge under goodwill.

  Symptoms: Knocking or ticking engine noises beyond normal diesel clatter, sudden engine failure, timing chain fault codes
  3,500–20,000 $
  Ad camshaft 3.0 TDI CLAA059109021camshaft 3.0 TDI V6
• !! Timing chain elongation from 150,000 km

  The 3.0 TDI V6 has four timing chains: two per cylinder bank for the camshafts, one connecting chain, and one for the oil pump. Elongation leads to incorrect valve timing and can cause catastrophic engine damage. Replacement requires 15–20 labour hours.

  Symptoms: Rattling on cold start, camshaft fault codes in ECU, rough running, power loss
  2,000–4,000 $
  Ad timing chain 3.0 TDI V6chain tensioner 3.0 TDI059109229timing chain CLAA
• !! High-pressure pump debris in fuel system from 160,000 km

  When the high-pressure pump fails, metal debris can contaminate the entire diesel system and damage the injectors. Audi A5/A6 with 3.0 TDI are affected. A full system flush and replacement of pump and injectors is then required, incurring very high costs.

  Symptoms: Starting problems, irregular engine running, fuel pressure fault, metallic noise from the engine bay
  1,500–12,000 $
  Ad high-pressure fuel pump 3.0 TDI057130755injection pump CLAA V6Common Rail pump 3.0 TDI

+ 3 more engine weaknesses + vehicle weaknesses

3.0-litre TDI V6 with 245 PS (C7 generation, EA897). Four-chain timing system — complex and maintenance-intensive; check for chain replacement from 150,000 km if rattling. Camshaft material defect known in early EA897 batches; check service history for camshaft replacement. Cam belt to CR pump every 120,000 km.

• !! Camshaft fracture from material defect from 80,000 km

  The 3.0 TDI EA897 in newer models is affected by camshaft fractures due to material defects. Audi acknowledged the issue via TPI 2043172. Primarily vehicles from production years 2014–2017.

  Symptoms: Ticking engine noises exceeding normal diesel combustion levels, increasing power loss, then engine failure
  3,500–20,000 $
  Ad camshaft 3.0 TDI CKNBcamshaft EA897camshaft A6 Q7 TDI 272
• !! Timing chain elongation from 120,000 km

  Chain elongation and tensioner wear on the 3.0 TDI CKNB can lead to the chain jumping a tooth. A full overhaul takes 15–20 hours, costing roughly €3,000 upwards.

  Symptoms: Rattling on cold start and under load, timing fault codes in OBD, occasional misfires
  2,500–4,500 $
  Ad timing chain CKNBtiming chain 3.0 TDI EA897chain tensioner A7 Q7 TDI
• !! Turbocharger wear and bearing damage from 150,000 km

  The bi-turbo 3.0 TDI shows turbocharger wear, partly from inadequate oil supply or deposits. Damage often occurs at high mileage or after long oil-change intervals.

  Symptoms: Whistling noise from the engine bay, blue exhaust smoke, power loss especially under load, elevated oil consumption
  1,500–4,000 $
  Ad turbocharger 3.0 TDI CKNBturbocharger V6 TDI A6 A7 Q7Lader 272 PS TDI

+ 2 more engine weaknesses + vehicle weaknesses

V6 diesel with 160 kW in the BiTDI variant after facelift. Highest output of the 3.0 TDI. Powerful drivetrain with electrically driven compressor.

• !! Camshaft Material Defect (CRT/CZV) from 100,000 km

  Material defect on camshafts of EA897 engines (272 hp and 218 hp) built 2014 to early 2017. A broken camshaft causes total engine failure. Audi performed goodwill repairs where service history was complete.

  Symptoms: Loud ticking or knocking from the engine bay clearly exceeding diesel combustion noise; often occurs on cold start or under load
  3,500–20,000 $
  Ad camshaft 3.0 TDI EA897059109101camshaft set CRT
• !! Timing Chain Stretch — Four Chains from 150,000 km

  The 3.0 TDI V6 uses four timing chains. From around 160,000 km cold-start rattling occurs. Timing chain replacement requires extensive engine removal and costs €1,500–4,500.

  Symptoms: Cold-start rattle that disappears as the engine warms up; engine check light; rough running
  2,500–5,000 $
  Ad timing chain 3.0 TDI V6059109229chain tensioner EA897
• !! Engine Damage from Low Oil Pressure (EA897evo) from 180,000 km

  The variable oil pump in the EA897evo reduces oil pressure at low rpm for Euro 6 optimisation. With fuel-diluted oil viscosity drops, which can lead to seizure damage.

  Symptoms: Rising oil level (fuel in oil), oil pump clatter, abrupt engine damage possible without warning
  8,000–25,000 $
  Ad oil pump 3.0 TDI EA897injector CRT CRTE059130277

+ 2 more engine weaknesses + vehicle weaknesses

Revised V6 diesel with 160 kW after facelift. Optimised emissions treatment with dual SCR dosing. Smooth-running and economical.

• !! Camshaft wear — material defect from 100,000 km

  The 3.0 TDI CZVA (218 hp) is affected by the known camshaft material defect. Audi TPI 2043172 covers CZV engine variants as well. Affected serial numbers are from early production (a few thousand engines). Camshaft fracture inevitably leads to total engine damage.

  Symptoms: Ticking or knocking noises beyond normal TDI clatter, camshaft control faults, power loss
  3,500–20,000 $
  Ad camshaft 3.0 TDI CZVA059109021camshaft V6 TDI 218PS
• !! Four-chain timing system elongation from 140,000 km

  The V6 3.0 TDI CZVA uses a four-chain timing system plus a toothed belt for the high-pressure fuel pump. The belt must be changed every 120,000 km. Chain elongation occurs primarily when oil maintenance is neglected and requires a complex repair.

  Symptoms: Rattling on cold start, camshaft phase faults, fuel system messages, power loss
  2,000–4,500 $
  Ad timing chain 3.0 TDItiming belt fuel pump 3.0 TDI059109229chain tensioner CZVA
• !! EGR valve coking — V6 TDI from 100,000 km

  The EGR system on the 3.0 TDI V6 CZVA is prone to coking from the high soot content in the exhaust gas. Sticking EGR valves reduce engine power and increase fuel consumption. Complete jamming can cause mechanical valve failure and additional costs.

  Symptoms: Power loss, increased fuel consumption, poor take-off, rough idle, fault code P0401
  400–1,200 $
  Ad EGR valve 3.0 TDI V6059131501EGR valve CZVA

+ 2 more engine weaknesses + vehicle weaknesses

V6 diesel with 200 kW in the BiTDI variant after facelift. Highest output of the 3.0 TDI. Powerful drivetrain with electrically driven compressor.

• !! Camshaft Material Defect (CRT/CZV) from 100,000 km

  Material defect on camshafts of EA897 engines (272 hp and 218 hp) built 2014 to early 2017. A broken camshaft causes total engine failure. Audi performed goodwill repairs where service history was complete.

  Symptoms: Loud ticking or knocking from the engine bay clearly exceeding diesel combustion noise; often occurs on cold start or under load
  3,500–20,000 $
  Ad camshaft 3.0 TDI EA897059109101camshaft set CRT
• !! Timing Chain Stretch — Four Chains from 150,000 km

  The 3.0 TDI V6 uses four timing chains. From around 160,000 km cold-start rattling occurs. Timing chain replacement requires extensive engine removal and costs €1,500–4,500.

  Symptoms: Cold-start rattle that disappears as the engine warms up; engine check light; rough running
  2,500–5,000 $
  Ad timing chain 3.0 TDI V6059109229chain tensioner EA897
• !! Engine Damage from Low Oil Pressure (EA897evo) from 180,000 km

  The variable oil pump in the EA897evo reduces oil pressure at low rpm for Euro 6 optimisation. With fuel-diluted oil viscosity drops, which can lead to seizure damage.

  Symptoms: Rising oil level (fuel in oil), oil pump clatter, abrupt engine damage possible without warning
  8,000–25,000 $
  Ad oil pump 3.0 TDI EA897injector CRT CRTE059130277

+ 2 more engine weaknesses + vehicle weaknesses

V6 diesel with 170 kW and 48V mild hybrid. Entry V6 of the A6 C8 with effortless torque and low fuel consumption for the vehicle class.

• !! Camshaft wear — material defect from 100,000 km

  The 3.0 TDI CZVA (218 hp) is affected by the known camshaft material defect. Audi TPI 2043172 covers CZV engine variants as well. Affected serial numbers are from early production (a few thousand engines). Camshaft fracture inevitably leads to total engine damage.

  Symptoms: Ticking or knocking noises beyond normal TDI clatter, camshaft control faults, power loss
  3,500–20,000 $
  Ad camshaft 3.0 TDI CZVA059109021camshaft V6 TDI 218PS
• !! Four-chain timing system elongation from 140,000 km

  The V6 3.0 TDI CZVA uses a four-chain timing system plus a toothed belt for the high-pressure fuel pump. The belt must be changed every 120,000 km. Chain elongation occurs primarily when oil maintenance is neglected and requires a complex repair.

  Symptoms: Rattling on cold start, camshaft phase faults, fuel system messages, power loss
  2,000–4,500 $
  Ad timing chain 3.0 TDItiming belt fuel pump 3.0 TDI059109229chain tensioner CZVA
• !! EGR valve coking — V6 TDI from 100,000 km

  The EGR system on the 3.0 TDI V6 CZVA is prone to coking from the high soot content in the exhaust gas. Sticking EGR valves reduce engine power and increase fuel consumption. Complete jamming can cause mechanical valve failure and additional costs.

  Symptoms: Power loss, increased fuel consumption, poor take-off, rough idle, fault code P0401
  400–1,200 $
  Ad EGR valve 3.0 TDI V6059131501EGR valve CZVA

+ 2 more engine weaknesses + vehicle weaknesses

V6 biturbo diesel with 230 kW. Twin-turbocharged six-cylinder for maximum pulling power. Complex design leads to higher maintenance costs.

• !! Exhaust Manifold Particles Damage High-Pressure Turbo from 100,000 km

  The inner lining of the air-gap-insulated exhaust manifold detaches over time. Metal particles enter the turbine wheel of the small high-pressure turbocharger and destroy it. Both parts must be replaced.

  Symptoms: Loud whistling or metallic rattling from the turbo, significant power loss especially below 2,000 rpm, delayed boost pressure buildup
  2,500–6,000 $
  Ad exhaust manifold 3.0 BiTDI CGQBturbocharger Hochdruck 3.0 TDI059145715059145721
• !! Camshaft Material Defect (EA897) from 100,000 km

  Like all EA897 third-generation engines, CGQB units are susceptible to camshaft breaks from material defects. Mainly affects vehicles from production period 2014–2017.

  Symptoms: Loud, unusual knocking or ticking from the engine bay; sound differs from normal diesel combustion noise
  3,500–15,000 $
  Ad camshaft 3.0 BiTDI059109101 CGQBcamshaft kit EA897
• !! Timing Chain 1.2 TFSI EA111 — Early Failure from 50,000 km

  The EA111 1.2 TFSI (CGQB) suffers from severe timing chain problems from as early as 30,000–40,000 km. Defective tensioners and worn guide rails lead to chain jump and total engine loss.

  Symptoms: Clattering rattle on cold start, engine warning light, in worst case sudden engine shutdown.
  700–3,000 $
  Ad timing chain CGQB 1.2 TFSIchain tensioner EA111 1.2 TSI Audi A1timing chain kit 1.2 TFSI

+ 3 more engine weaknesses + vehicle weaknesses

EA888 Gen 3 1.8 TFSI with 190 PS (140 kW) in the A6 C7 facelift and Q5. Direct injection and turbocharging for a good power-to-weight ratio. Carbon deposits on intake valves typical with pure FSI operation. Timing chain fine with regular oil changes.

• !! Timing chain wear from 120,000 km

  Despite improved tensioners in the Gen3, the timing chain can still stretch. Early detection through cold-start rattling is important, as chain damage can cause total engine failure.

  Symptoms: Metallic rattling on cold start that stops after warm-up; fault codes for camshaft deviation
  800–2,000 $
  Ad timing chain EA888 Gen3timing chain kit 1.8 TFSI CYJA
• !! High-pressure pump failure from 80,000 km

  The cam-driven high-pressure pump can fail and introduce fuel into the oil circuit. Pressure drops have been reported from as early as 54,000 km. If the pump leaks, the oil must be changed too.

  Symptoms: Engine stumbling, P0087 low-pressure fault, poor cold start, fuel smell in oil
  400–1,000 $
  Ad high-pressure fuel pump 1.8 TFSI Gen3high-pressure fuel pump CYJA06H127025N
• !! Electric water pump failure from 100,000 km

  Gen3 engines can be fitted with an electric auxiliary water pump that plays a central role in thermal management. Failure leads to localised overheating and warning lights.

  Symptoms: Coolant warning light, thermostat fault message, uneven engine temperature
  300–700 $
  Ad water pump EA888 Gen3coolant pump 1.8 TFSI CYJA

+ 3 more engine weaknesses + vehicle weaknesses

EA888 Gen2 with 132 kW. Solid four-cylinder turbo, however prone to increased oil consumption from the known piston ring issues of early EA888 generations.

• !! Timing Chain Stretch and Tensioner Failure from 120,000 km

  The CDNB EA888 Gen1 is known for stretching timing chains and undersized chain tensioners. At 100,000–150,000 km the chain can skip and cause severe engine damage.

  Symptoms: Rattling on cold start (disappears after warm-up), engine warning light, in extreme cases engine damage
  800–2,000 $
  Ad timing chain Kit CDNB EA888chain tensioner 2.0 TFSI CDN06H109467 chain tensioner
• !! Oil Consumption Due to Undersized Oil Scraper Rings from 60,000 km

  Up to 785,000 EA888 engines (2008–2011) were built with undersized oil scraper rings (1.5 mm instead of 2 mm). Consumption of 1 liter per 800–1,000 km was not uncommon.

  Symptoms: Top-up needed every 2,000–3,000 km, blue exhaust under load, oil consumption despite otherwise healthy engine
  2,000–5,000 $
  Ad piston rings 2.0 TFSI EA888 CDNBÜberarbeitete piston EA888 Gen1
• !! Diverter Valve and Turbo Wear from 100,000 km

  The N249 diverter valve on the CDNB wears out early and causes irregular boost pressure. Turbocharger bearing damage from oil starvation or improper shutdown after spirited driving is also known.

  Symptoms: Hissing after throttle lift, power loss, fluctuating boost pressure, whistling from the turbo
  50–2,500 $
  Ad Schubumluftventil CDNB 2.0 TFSIN249 valve 06H145710turbocharger 2.0 TFSI EA888

+ 2 more engine weaknesses + vehicle weaknesses

EA888 Gen3 (220/224 PS) — more robust development over Gen1/2, but still suffers from chain tensioner issues and a weak stock oil pump at idle. Direct injection causes carbon build-up. Very long-lived with maintained oil change intervals.

• !! Oil Pump Delivers Insufficient Pressure at Idle from 80,000 km

  The stock oil pump reduces pressure at idle for better efficiency. This leads to oil starvation at the camshaft adjusters and accelerated wear of bearing surfaces and the timing chain.

  Symptoms: Rattling and clattering on cold start or at idle, sporadic fault codes for camshaft adjusters, rough idle
  800–2,500 $
  Ad oil pump EA888 Gen3 06K115105oil pump upgrade CNCD
• !! Chain Stretch and Tensioner Failure from 100,000 km

  The hydraulic chain tensioners are delicate and prone to hardening from oil coke. A snapped timing chain causes total engine destruction. Also occurs on 2013–2015 model years.

  Symptoms: Irregular rattling at warm idle, engine light with timing chain fault codes, in worst case engine failure
  1,500–9,000 $
  Ad timing chain CNCD 2.0 TFSIchain tensioner EA888 Gen3
• !! Hydraulic Chain Tensioners Lose Oil Pressure from 90,000 km

  The CNCD has two hydraulic chain tensioners that lose pressure at warm, low-viscosity oil and allow the chain to rattle. If neglected, chain jump is a risk.

  Symptoms: Irregular rattling at idle after prolonged operation, noise disappears at higher rpm.
  1,200–3,500 $
  Ad chain tensioner CNCD 2.0 TFSItiming chain CNCD hydraulictiming chain EA888 Gen3

+ 3 more engine weaknesses + vehicle weaknesses

EA888 Gen3B with improved piston design and strengthened timing chain over predecessors. Oil pump remains a structural weak point across the entire EA888 family. Significantly more reliable than Gen1/2 with correct oil change intervals and quality oil. Direct injection promotes intake valve carbon build-up at medium mileages.

• !! Oil pump — pressure deficit at idle from 80,000 km

  The Gen3B variable oil pump delivers insufficient oil pressure at low rpm. Camshaft phaser rattling and premature chain wear result. Particularly problematic in short-trip urban driving.

  Symptoms: Rattling/knocking after cold start, oil pressure warning at idle, camshaft phaser fault codes
  400–1,200 $
  Ad oil pump Upgrade CYRB A4 B9variable oil pump EA888 Gen3B 252PSÖldruck A4 B9 2.0 TFSI
• !! Recall: belt starter-generator fire risk

  Recalls 27H2/27H8 (2020): moisture ingress into the belt starter-generator (48V MHEV system) causes short circuits and overheating with fire risk. ~530,000 vehicles worldwide (A4, A5, A6, A7, Q5, production years 2017–2020). Audi advised against garage parking until repair.

  Symptoms: Sequential electrical fault messages, vehicle shuts down, in worst case smoke / fire
  0–0 $
  Ad Riemenstartergenerator CYRB recall 27H2RSG A4 B9 45 TFSI replacementStartergenerator 48V A4 B9
• !! Timing chain — cold-start rattle from pressure drop from 100,000 km

  Early A4 B9 (2016–2017) with CYRB show cold-start rattling from chain tensioner oil pressure loss overnight. Oil pressure takes 2–3 seconds to build; tensioner does not tension the chain fast enough. Chain inspection recommended from ~100,000 km.

  Symptoms: Brief rattling on cold start (2–5 sec), P0016/P0017 after extended standing, metallic clattering
  800–1,700 $
  Ad timing chain CYRB A4 B9chain tensioner 2.0 TFSI 252PS B9timing chain kit EA888 Gen3B

+ 5 more engine weaknesses + vehicle weaknesses

Naturally aspirated V6 with petrol direct injection. Smooth running and linear throttle response, but prone to intake valve carbon build-up due to direct injection.

• !! Timing Chain Stretched (Gearbox Side) from 160,000 km

  The 2.8 FSI has three timing chains installed on the gearbox side. Replacement requires full engine removal, making the repair particularly expensive. Rattling on cold start appears from around 150,000 km.

  Symptoms: Metallic rattling on cold start that settles after warm-up; with severe stretch also rattling under load
  2,500–5,000 $
  Ad timing chain 2.8 FSItiming chain kit CHVAchain tensioner V6 FSI
• !! Intake Valve Carbon Buildup from 80,000 km

  Like all FSI engines without port injection, oil carbon deposits build up on the intake valves. Fuel additives do not help — only mechanical cleaning (walnut blasting) reliably removes the deposits.

  Symptoms: Power loss, rough cold running, increased fuel consumption, occasional misfires on cold start
  300–700 $
  Ad intake valvee 2.8 FSI V6Walnussstrahlen FSI
• !! Elevated Oil Consumption from 120,000 km

  Individual examples show significantly elevated oil consumption of over 1 liter per 1,000 km. The cause is worn piston rings or cylinder walls. Audi replaced complete engines in some warranty cases.

  Symptoms: Blue exhaust clouds when accelerating, oil level drops noticeably between services, engine oil smell after driving
  1,500–6,000 $
  Ad piston rings 2.8 FSI V6cylinder head CHVA

+ 2 more engine weaknesses + vehicle weaknesses

Supercharged V6 with 228 kW. Powerful and rev-happy engine, but the supercharger drive belt is a known wear item.

• !! Internal Supercharger Intercooler Leaking from 150,000 km

  The integrated intercooler in the Eaton supercharger fails due to thermal fatigue. Coolant enters the cylinders via the intake — risk of hydraulic lock engine damage.

  Symptoms: Coolant loss without external leaks, cylinder 3 misfires, white exhaust cloud, power loss.
  1,000–2,500 $
  Ad intercooler intern CGWB A6 C7 3.0 TFSIIntercooler supercharger gasket EA837Eaton Intercooler 3.0 TFSI A7
• !! Chain Tensioner Rattle on Cold Start from 60,000 km

  As across the EA837 family, the upper chain tensioners in the CGWB lose oil pressure at rest. Brief cold-start rattle. CGWB-specific: missing check valves in the oil passage accelerate pressure loss.

  Symptoms: Metallic rattle 1–2 seconds after engine start, fades as oil pressure rises. Persistent noise with damaged chain guides.
  1,200–2,000 $
  Ad chain tensioner CGWB 3.0 TFSI A6 C7timing chain obere chain CGWBchainnführung EA837 A6
• !! Coolant Pump and Thermostat Failure from 100,000 km

  Coolant pump and thermostat fail at high mileages. A6 C7 with 3.0 TFSI also has engine mount problems around 50,000 km that increase thermal stress.

  Symptoms: Temperature gauge fluctuates or rises too high, coolant loss, cold engine on start despite warm-up.
  400–1,200 $
  Ad water pump CGWB 3.0 TFSI A6 C7thermostat EA837 A6 A7 3.0 TFSIcoolantkreislauf CGWB

+ 5 more engine weaknesses + vehicle weaknesses

Supercharged V6 with 220 kW. Mechanically identical to CGWB in a slightly detuned variant. Very refined drivetrain with ample power reserves.

• !! Internal Intercooler Leaking from 150,000 km

  The integrated intercooler in the Eaton supercharger can leak coolant into the intake path — risk of catastrophic engine damage through hydraulic lock.

  Symptoms: Unexplained coolant loss, misfires, white exhaust smoke, power loss.
  1,000–2,500 $
  Ad intercooler intern CEUC 3.0 TFSIIntercooler supercharger EA837 CEUC A6gasket intern intercooler 3.0 TFSI A6 C7
• !! Chain Tensioner Rattle on Cold Start from 70,000 km

  EA837-typical weakness: chain tensioners lose oil pressure at rest. On cold start the upper timing chain rattles briefly. Neglect risks damage to chain guides.

  Symptoms: Brief metallic rattle 1–2 seconds after cold start, disappears completely afterwards.
  1,200–2,000 $
  Ad chain tensioner CEUC 3.0 TFSI A6 C7timing chain EA837 CEUC 220 kWchainnführung 3.0 TFSI A6 C7
• !! Coolant Pump Failure at High Mileage from 100,000 km

  Coolant pump shows leaks or mechanical failure at high mileages. The A6 C7 3.0 TFSI places high thermal demands on the cooling system.

  Symptoms: Coolant loss, overheating warning, temperature gauge fluctuating.
  400–1,200 $
  Ad water pump CEUC 3.0 TFSI A6 C7coolant pump EA837 220 kWthermostat CEUC A6 C7

+ 4 more engine weaknesses + vehicle weaknesses

Supercharged V6 with 245 kW after facelift. Most powerful supercharger variant of the EA837 in A6/A7. Excellent long-distance engine.

• !! Internal Intercooler Leaking from 130,000 km

  Coolant leakage into the integrated supercharger intercooler is particularly critical in the CTUA due to the higher boost pressure (245 kW) — hydraulic lock is possible.

  Symptoms: Coolant loss, white exhaust cloud, cylinder 3 misfires, power loss.
  1,000–2,500 $
  Ad intercooler intern CTUA S6 A6 C7 3.0 TFSIIntercooler Eaton supercharger 245 kW EA837gasket intercooler CTUA
• !! Chain Tensioner Rattle on Cold Start from 60,000 km

  EA837-typical: upper chain tensioners lose oil pressure at rest, brief rattle on cold start. The CTUA as the performance variant (S6) runs under higher thermal load.

  Symptoms: Brief metallic rattle after cold start, gone after 1–2 seconds. With wear, permanent chain noise.
  1,200–2,000 $
  Ad chain tensioner CTUA 3.0 TFSI S6 A6 C7timing chain EA837 245 kWchainnführung CTUA A7 Sportback
• !! Coolant Pump Failure from 100,000 km

  Coolant pump and thermostat fail at high mileages. S6/A7 3.0 TFSI at 245 kW places high demands on the cooling system.

  Symptoms: Overheating warning, coolant loss, unstable temperature gauge.
  400–1,200 $
  Ad water pump CTUA 3.0 TFSI S6coolant pump EA837 CTUA A7 A6thermostat 3.0 TFSI 245 kW

+ 4 more engine weaknesses + vehicle weaknesses

Hot-V design: both turbos sit in the V-angle between the cylinder banks, directly above the exhaust system. This shortens charge pipes and delivers lightning-fast response without noticeable turbo lag, but concentrates heat and oil stress in one place. Audi had to issue recall 21H7 in 2022 for all vehicles built between 2012–2017: an overly fine oil strainer in the turbo oil circuit clogged — total turbo failure in many cases. The sound is muted by engine encapsulation, but has character. The overall performance — 560 PS, eight-speed Tiptronic, quattro — makes the C7 RS6/RS7 the most competent everyday fast car of its era. Always verify recall status before purchase.

• !! Recall 21H7 — oil strainer blocks turbo supply

  The overly fine oil strainer in the oil feed to both turbochargers can become blocked with carbon deposits, cutting off turbo lubrication. KBA recall 21H7 for vehicles up to March 2017 (12,204 in Germany).

  Symptoms: Sudden power loss, misfires, in the worst case complete engine failure without warning
  0–500 $
  Ad Ölsieb 4.0 TFSI079103175G check valverecall 21H7
• !! Camshaft wear — head and shaft as a unit from 150,000 km

  The camshafts are factory-matched to their respective cylinder heads; on wear, the head and camshaft must be replaced as a unit, which significantly increases repair costs.

  Symptoms: Ticking from the valvetrain, rough running, power loss at high rpm
  5,000–15,000 $
  Ad camshaft 4.0 TFSI CWUBcamshaft RS6 C7 V8
• !! Timing chain stretched — V8 chain drive from 160,000 km

  Complex chain drive; idle fluctuations with camshaft synchronisation fault codes may indicate stretched chains or broken guide rails.

  Symptoms: Rattling on cold start, idle fluctuations, camshaft position fault codes (P0017, P0022)
  3,000–8,000 $
  Ad timing chain 4.0 TFSItiming chain Kit V8 EA824chain tensioner CWUB

+ 7 more engine weaknesses + vehicle weaknesses

Performance variant of the 4.0 TFSI with 605 PS — same Hot-V architecture as CWUB, sharper mapping, larger turbos, freer exhaust flow. Recall 21H7 (oil strainer in the turbo oil circuit) affects the CRDB just as it does the CWUB — essential to verify it has been completed before purchase. Noticeably more direct throttle response and more aggressive character in Dynamic mode compared to the base CWUB. Sport differential and lowered suspension standard. The C7 Performance is considered the sweet spot of the range: no OPF, no mild hybrid, sharpest tune — owners who then drive the C8 reportedly miss the sharper throttle response and the unfiltered V8 sound.

• !! Turbocharger Bearing Failure from Oil Starvation from 60,000 km

  Both turbochargers can fail simultaneously if the oil strainer clogs and interrupts bearing lubrication. Primarily affects 2012–2017 model years before the recall; even brief oil starvation causes total failure.

  Symptoms: Loud whistling or screeching from the engine bay, power loss, engine stalling under high load
  4,000–12,000 $
  Ad turbocharger RS6 C7turbo CRDB 4.0 TFSI06E145601 turbocharger
• !! Recall: Turbocharger Oil Strainer Too Fine from 60,000 km

  The oil strainer in the turbocharger oil circuit is too fine-mesh and clogs with soot and oil deposits. This leads to insufficient turbo bearing lubrication and can cause engine failure. Recall 21H7.

  Symptoms: Sudden power loss, engine failure while driving, no prior warning from indicator lights
  0–0 $
  Ad turbocharger S6 C7 4.0 TFSIoil strainer turbo CRDBturbo bearing RS6 C706E145601
• !! Camshaft Wear-In from 100,000 km

  The camshafts on the 4.0 TFSI wear in because they are factory-matched to specific cylinder heads and deteriorate with insufficient oil supply. Replacement often requires cylinder head overhaul.

  Symptoms: Ticking or knocking from the valve train, engine roughness, uneven idle, camshaft fault codes
  2,000–6,000 $
  Ad camshaft S6 C7 4.0 TFSIcamshaft CRDBcamshaft adjuster 4.0 TFSI

+ 7 more engine weaknesses + vehicle weaknesses

Biturbo V8 with 309 kW for S6/S7 C7 and S8 D4. Detuned version of the RS V8 with cylinder deactivation. Comfortable and powerful at the same time.

• !! Recall 21H7 — Oil Strainer Turbocharger Supply from 60,000 km

  KBA recall (code 21H7) for S6 and RS6 built June 2012 to March 2017: the too-fine oil strainer restricts turbocharger lubrication. Replacement with a coarser-mesh strainer required. Without repair, turbo damage can result.

  Symptoms: Power loss, whistling turbo noise, engine check light; in advanced cases metallic swarf in oil
  0–500 $
  Ad oil strainer turbocharger 4.0 TFSIoil filter strainer S6 S7079115561
• !! Timing Chain Stretch — V8 BiTurbo from 170,000 km

  At high mileages (150,000–200,000 km) 4.0 TFSI engines show timing chain stretch, recognisable by camshaft synchronisation faults. Repair requires extensive engine work on the V8.

  Symptoms: Idle fluctuations, camshaft synchronisation fault codes, rattling on cold start from the front timing drive
  3,000–8,000 $
  Ad timing chain 4.0 TFSI V8079109158chain kit CTGA V8
• !! High-Pressure Fuel Pump — Wear from 140,000 km

  The high-pressure fuel pump on the 4.0 TFSI is a known wear component. Pressure loss causes injection problems and uneven combustion. Wear increases with long service intervals or poor fuel quality.

  Symptoms: Rough running, injection noise, power loss at high rpm, cold-start problems
  800–2,500 $
  Ad high pressure pump 4.0 TFSI079127026fuel pump V8 CTGA

+ 7 more engine weaknesses + vehicle weaknesses

4.0-litre TFSI V8 BiTurbo with 450 PS (EA825). Prone to oil strainer contamination — regular oil changes every 10,000 km are mandatory. High-pressure pump pressure piece wears at higher mileage; uprated version available. Tiptronic shift issues documented from 150,000 km.

• !! Turbocharger Damage from Insufficient Lubrication from 70,000 km

  Turbocharger damage occurs frequently on the 4.0 TFSI V8 and is attributed to insufficient oil supply. First signs often appear from 60,000–80,000 km with power loss and noise.

  Symptoms: Power loss, whistling or howling noises, elevated oil consumption, blue smoke
  3,000–8,000 $
  Ad turbocharger 4.0 TFSI V8BiTurbo CTGB S6 S7
• !! Cylinder Bore Coating Damage from 150,000 km

  The aluminium block with coated cylinder bores does not allow conventional oversize piston repair. Damage requires expensive engine replacement or complete overhaul.

  Symptoms: High oil consumption, power loss, blue smoke, combustion noise
  8,000–20,000 $
  Ad cylinder bore 4.0 TFSI V8engine rebuild CTGB
• !! S-Tronic DCT as the Weak Point from 100,000 km

  The S-Tronic dual-clutch gearbox is the weakest link in the S6 C7 drivetrain. Aggressive driving and power fluctuations at higher rpm put additional strain on the DCT.

  Symptoms: Jerk on gear changes, clutch slip, overheating warning, failed shifts
  3,000–8,000 $
  Ad S-Tronic DCT 4.0 TFSIdual clutch transmission S6 C7

+ 2 more engine weaknesses + vehicle weaknesses

Biturbo V8 with 309 kW for S6/S7 C7 and S8 D4. Detuned version of the RS V8 with cylinder deactivation. Comfortable and powerful at the same time.

• !! Recall 21H7 — Oil Strainer Turbocharger Supply from 60,000 km

  KBA recall (code 21H7) for S6 and RS6 built June 2012 to March 2017: the too-fine oil strainer restricts turbocharger lubrication. Replacement with a coarser-mesh strainer required. Without repair, turbo damage can result.

  Symptoms: Power loss, whistling turbo noise, engine check light; in advanced cases metallic swarf in oil
  0–500 $
  Ad oil strainer turbocharger 4.0 TFSIoil filter strainer S6 S7079115561
• !! Timing Chain Stretch — V8 BiTurbo from 170,000 km

  At high mileages (150,000–200,000 km) 4.0 TFSI engines show timing chain stretch, recognisable by camshaft synchronisation faults. Repair requires extensive engine work on the V8.

  Symptoms: Idle fluctuations, camshaft synchronisation fault codes, rattling on cold start from the front timing drive
  3,000–8,000 $
  Ad timing chain 4.0 TFSI V8079109158chain kit CTGA V8
• !! High-Pressure Fuel Pump — Wear from 140,000 km

  The high-pressure fuel pump on the 4.0 TFSI is a known wear component. Pressure loss causes injection problems and uneven combustion. Wear increases with long service intervals or poor fuel quality.

  Symptoms: Rough running, injection noise, power loss at high rpm, cold-start problems
  800–2,500 $
  Ad high pressure pump 4.0 TFSI079127026fuel pump V8 CTGA

+ 7 more engine weaknesses + vehicle weaknesses