Audi Q5 FY

Revised EA897 with improved emissions treatment — three catalysts (oxidation cat, particulate filter with SCR coating, second SCR catalyst) reduce real-world NOx by over 90 percent. The electric compressor (EAV) responds even faster than on the predecessor: under 250 milliseconds to full boost, 700 Nm already on tap at 1,750 rpm. Technical detail: the revised EAV is now water-cooled and spins up to 90,000 rpm — significantly higher than the predecessor. The 48V BSG recuperates up to 8 kW and enables genuine engine-off coasting. Camshaft fractures remain the known major failure pattern for this engine family — check service history before purchase, request TPI documentation. The four-chain camshaft drive is maintenance-intensive; longlife intervals are not recommended at this mileage. If diesel is your thing and turbo lag is your enemy, this is one of the most convincing solutions the market has ever produced.

• !! Timing chain wear and tensioner failure from 80,000 km

  The V6 3.0 TDI has four timing chains that wear prematurely with poor maintenance. Rattling on cold start is the typical warning. Complete chain drive replacement costs approx. €3,000.

  Symptoms: Rattling or clattering noises on cold start, timing chain warning in instrument cluster
  2,500–3,500 $
  Ad timing chain 3.0 TDI V6chain tensioner EA897timing chainntrieb DTNS
• !! Camshaft fracture due to material defect from 90,000 km

  On EA897 EVO engines with certain serial numbers (CRT 000001–073951), camshafts can break due to material defects. A break inevitably causes severe engine damage.

  Symptoms: Sudden loss of power, rough running, engine stall without prior warning
  3,000–8,000 $
  Ad camshaft EA897 EVOcamshaft 3.0 TDI V6
• !! Coolant loss from defective control valves from 90,000 km

  Faulty plastic coolant control valves cause coolant loss. The plastic welded joint becomes porous and leaks. Repair costs are around €1,200–1,400.

  Symptoms: Dropping coolant level, rising temperature, coolant loss without visible external leak
  1,200–1,500 $
  Ad coolantregelventil 3.0 TDIthermostat EA897

+ 3 more engine weaknesses + vehicle weaknesses

Revised EA897 with improved emissions treatment — three catalysts (oxidation cat, particulate filter with SCR coating, second SCR catalyst) reduce real-world NOx by over 90 percent. The electric compressor (EAV) responds even faster than on the predecessor: under 250 milliseconds to full boost, 700 Nm already on tap at 1,750 rpm. Technical detail: the revised EAV is now water-cooled and spins up to 90,000 rpm — significantly higher than the predecessor. The 48V BSG recuperates up to 8 kW and enables genuine engine-off coasting. Camshaft fractures remain the known major failure pattern for this engine family — check service history before purchase, request TPI documentation. The four-chain camshaft drive is maintenance-intensive; longlife intervals are not recommended at this mileage. If diesel is your thing and turbo lag is your enemy, this is one of the most convincing solutions the market has ever produced.

• !! Timing chain wear and tensioner failure from 80,000 km

  The V6 3.0 TDI has four timing chains that wear prematurely with poor maintenance. Rattling on cold start is the typical warning. Complete chain drive replacement costs approx. €3,000.

  Symptoms: Rattling or clattering noises on cold start, timing chain warning in instrument cluster
  2,500–3,500 $
  Ad timing chain 3.0 TDI V6chain tensioner EA897timing chainntrieb DTNS
• !! Camshaft fracture due to material defect from 90,000 km

  On EA897 EVO engines with certain serial numbers (CRT 000001–073951), camshafts can break due to material defects. A break inevitably causes severe engine damage.

  Symptoms: Sudden loss of power, rough running, engine stall without prior warning
  3,000–8,000 $
  Ad camshaft EA897 EVOcamshaft 3.0 TDI V6
• !! Coolant loss from defective control valves from 90,000 km

  Faulty plastic coolant control valves cause coolant loss. The plastic welded joint becomes porous and leaks. Repair costs are around €1,200–1,400.

  Symptoms: Dropping coolant level, rising temperature, coolant loss without visible external leak
  1,200–1,500 $
  Ad coolantregelventil 3.0 TDIthermostat EA897

+ 3 more engine weaknesses + vehicle weaknesses

EA288 generation 2.0-litre diesel as successor to the EA189. Fundamentally more mature and reliable than its predecessor, but EGR valve and DPF are critical weak points with short-trip use. With correct service intervals, mileages over 300,000 km are realistic.

• !! Turbocharger Bearing Damage from 200,000 km

  At high mileage or from DPF-related oil contamination, turbocharger bearings can wear. Typical BorgWarner turbo on the DETA shows problems from around 200,000 km.

  Symptoms: Whistling or howling noises, power loss, blue smoke, oil in intake pipe, fault code P0299
  900–1,800 $
  Ad turbocharger EA288 DETA BorgWarner04L253014Turbo Überholung 2.0 TDI EA288
• !! Camshaft Seal Leaks Oil onto Timing Belt from 120,000 km

  A defective camshaft shaft seal allows oil to escape onto the timing belt, significantly shortening its service life. Detected too late, the belt breaks and causes engine damage.

  Symptoms: Oil spots in the timing belt area, belt appears shiny/oily, whistling from the belt drive
  300–700 $
  Ad camshaftndichtring EA288 DETAWellendichtring camshaft 2.0 TDI04L103085
• !! Early Water Pump Failure from 60,000 km

  Early EA288 engines up to production date September 2014 had a faulty water pump with a defective control valve (TPI 2041955). Coolant temperature rises to up to 130°C.

  Symptoms: Coolant temperature exceeds 120°C, red temperature warning light, coolant loss with no visible external leak
  300–600 $
  Ad TPI 2041955water pump EA288 DETAcoolant pump 2.0 TDI 04L121011

+ 2 more engine weaknesses + vehicle weaknesses

EA288 Evo with 150 kW and 48V mild hybrid. Most powerful variant of the 2.0 TDI with quattro all-wheel drive. Strong everyday diesel.

• !! EGR cooler leak and coolant loss from 90,000 km

  The EA288 Evo derivative DTNA shares the EGR cooler leak susceptibility common across the entire EA288 engine family. Cracks in the cooler allow coolant into the exhaust tract. Fault code P0401, coolant loss without visible external leak is characteristic.

  Symptoms: Coolant loss without visible leak, white smoke from exhaust, dropping coolant level, overheating warning
  600–1,000 $
  Ad EGR radiator EA288 Evo04L131512EGR-radiator DTNA 2.0 TDI
• !! Wet timing belt in oil bath — wear from 150,000 km

  The EA288 Evo DTNA, like its predecessors, uses a wet-running timing belt in an oil bath. With missed or extended oil-change intervals and incorrect oil grades, belt material degrades prematurely. No officially set replacement interval from Audi/VW increases the risk.

  Symptoms: Whistling, rubber fibres in engine oil, irregular firing order, engine stutter, ECU faults
  500–900 $
  Ad timing belt EA288 Evo DTNASteuertrieb 2.0 TDI Evo04L109119
• !! Turbo oil supply line — carbon deposits from 120,000 km

  On the EA839 3.0 TFSI, the oil feed line to the turbocharger can become partially blocked by coked oil (Longlife intervals), causing turbo bearing failure.

  Symptoms: Whining/whistling from turbo, power loss, blue smoke, metal particles in oil.
  2,000–6,000 $
  Ad turbocharger EA839 3.0 TFSIturbochargerlager DTNA S4 B9Turbo 3.0 TFSI CZVC S5

+ 3 more engine weaknesses + vehicle weaknesses

V6 diesel with 210 kW and 48V mild hybrid. Most powerful V6 diesel in the Audi range. Excellent long-distance engine with abundant torque.

• !! Timing chain rattles on cold start from 120,000 km

  Hydraulic chain tensioners lose oil pressure on cold engine. At start-up the chain rattles loudly for 1–3 seconds. Advanced wear risks chain jump and engine failure.

  Symptoms: Loud rattling or clattering directly after cold start, subsiding after a few seconds. With greater wear, rattle persists when warm.
  2,500–4,000 $
  Ad timing chain 3.0 TDI V6chain tensioner DTHAtiming chain kit V6 TDI
• !! Camshaft fracture — material defect from 100,000 km

  On 272-hp variants (built up to Jan 2017) camshafts broke due to material defects. On failure, metal fragments can destroy the engine. Audi replaced camshafts as a goodwill gesture.

  Symptoms: Clicking or rattling from the valve train, rough engine, engine oil contaminated with metal particles.
  3,500–20,000 $
  Ad camshaft 3.0 TDI V6camshaft kit DTHA
• !! AdBlue system: pump and injector failure from 80,000 km

  AdBlue pump, heating element or injector fails, especially after frost periods. Engine remains unaffected, but the vehicle will not start after several cycles.

  Symptoms: AdBlue system fault warning on display, SCR fault codes, restricted drive readiness once warning counter expires.
  700–3,000 $
  Ad AdBlue pump 3.0 TDISCR fuel injector DTHAAdBlue Heizelement

+ 2 more engine weaknesses + vehicle weaknesses

The first diesel with an S badge in history — and that is not a marketing claim, it is a technical statement. The EA897 evo delivers 700 Nm across a wide band, and the electric compressor (EAV) closes the gap between throttle input and turbo boost build-up in under 250 milliseconds. The result is a diesel with no perceptible turbo lag — when powering out of corners or overtaking, the engine responds immediately because the EAV is already compressing air with up to 7 kW before the exhaust turbo gets up to speed. The 48V system carries not just the EAV but also the belt starter-generator for recuperation and coasting. On the maintenance side: camshaft fractures are the known catastrophic failure pattern of this EA897 generation. Check service history carefully before purchase and ask for evidence of completed TPI measures. Oil pressure drop at idle is by design due to the electronically controlled oil pump — not a fault, but worth noting if it shows up under load.

• !! Low oil pressure from variable oil pump from 150,000 km

  The ECU-controlled oil pump reduces pressure at idle to approx. 1.0–1.4 bar. At high motorway oil temperatures with bearing wear, this pressure is insufficient — con-rod bearings seize from 150,000 km.

  Symptoms: Oil pressure warning at idle or on country roads, knocking noises, in severe cases engine failure
  8,000–20,000 $
  Ad Öldruckregelventil 3.0 TDI EA897 059119
• !! Camshaft breakage (material defect) from 80,000 km

  All 272-hp variants built before January 2017 contained faulty camshafts. Tooth flank noise and fractures are possible; Audi acknowledges the problem, goodwill depends on mileage.

  Symptoms: Clattering or ticking from camshafts even after brief warm-up, rough running, in severe cases sudden engine stall
  3,500–20,000 $
  Ad camshaft 3.0 TDI EA897 059109021
• !! Timing chain drive worn (4-chain system) from 160,000 km

  The EA897 uses four timing chains — one per cylinder bank, one connecting chain and one for the oil pump. All chains, tensioners and guides must be renewed together.

  Symptoms: Rattling on cold start, metallic knock on throttle, engine light with camshaft faults
  2,500–5,000 $
  Ad timing chain 3.0 TDI EA897 059109229

+ 2 more engine weaknesses + vehicle weaknesses

The first diesel with an S badge in history — and that is not a marketing claim, it is a technical statement. The EA897 evo delivers 700 Nm across a wide band, and the electric compressor (EAV) closes the gap between throttle input and turbo boost build-up in under 250 milliseconds. The result is a diesel with no perceptible turbo lag — when powering out of corners or overtaking, the engine responds immediately because the EAV is already compressing air with up to 7 kW before the exhaust turbo gets up to speed. The 48V system carries not just the EAV but also the belt starter-generator for recuperation and coasting. On the maintenance side: camshaft fractures are the known catastrophic failure pattern of this EA897 generation. Check service history carefully before purchase and ask for evidence of completed TPI measures. Oil pressure drop at idle is by design due to the electronically controlled oil pump — not a fault, but worth noting if it shows up under load.

• !! Low oil pressure from variable oil pump from 150,000 km

  The ECU-controlled oil pump reduces pressure at idle to approx. 1.0–1.4 bar. At high motorway oil temperatures with bearing wear, this pressure is insufficient — con-rod bearings seize from 150,000 km.

  Symptoms: Oil pressure warning at idle or on country roads, knocking noises, in severe cases engine failure
  8,000–20,000 $
  Ad Öldruckregelventil 3.0 TDI EA897 059119
• !! Camshaft breakage (material defect) from 80,000 km

  All 272-hp variants built before January 2017 contained faulty camshafts. Tooth flank noise and fractures are possible; Audi acknowledges the problem, goodwill depends on mileage.

  Symptoms: Clattering or ticking from camshafts even after brief warm-up, rough running, in severe cases sudden engine stall
  3,500–20,000 $
  Ad camshaft 3.0 TDI EA897 059109021
• !! Timing chain drive worn (4-chain system) from 160,000 km

  The EA897 uses four timing chains — one per cylinder bank, one connecting chain and one for the oil pump. All chains, tensioners and guides must be renewed together.

  Symptoms: Rattling on cold start, metallic knock on throttle, engine light with camshaft faults
  2,500–5,000 $
  Ad timing chain 3.0 TDI EA897 059109229

+ 2 more engine weaknesses + vehicle weaknesses

Strong EA888 Gen3B variant with 180 kW for the Q3 Sportback. Quattro standard, S tronic as the only gearbox option. Powerful and efficient.

• !! OPF Particulate Filter Clogged — Short-Trip Use from 80,000 km

  The DMTA petrol particulate filter (OPF) requires regeneration cycles at sufficiently high exhaust temperatures. With frequent short-trip use or cold temperatures, the OPF cannot regenerate fully and clogs. Extended motorway drives often fix the problem.

  Symptoms: Power loss, P200200 OPF efficiency fault, increased fuel consumption, MIL
  500–2,500 $
  Ad OPF particulate filter DMTA Q3 A6 C8Otto-particulate filter Regeneration EA888 evoOPF cleaning 2.0 TFSI 265PS evo
• !! Water Pump — Housing Failure from 120,000 km

  EA888 evo uses an improved cooling system, but fundamentally the same water pump design. Early long-term experience still limited; the known Gen3/Gen3B plastic pump weakness is considered a risk.

  Symptoms: Coolant loss, overheating warning, coolant smell
  300–600 $
  Ad water pump DMTA EA888 evocoolant pump Q3 F3 2.0 TFSI 265PSwater pump A6 C8 EA888
• !! VTG Turbocharger — Actuator Issues (New for Petrol Engines)

  The DMTA is one of the first petrol engines with variable turbine geometry (VTG). The electric actuator for the VTG vanes is a new component without sufficient long-term experience. Soot deposits from OPF operation could block VTG vanes. Issues known from diesel VTG may occur analogously.

  Symptoms: Boost pressure instability, turbo noises, power loss, MIL with turbocharger codes
  600–3,000 $
  Ad VTG turbocharger DMTA EA888 evoactuator motor VTG 2.0 TFSI evoVTG Turbo Q3 F3 A6 C8 265PS

+ 4 more engine weaknesses + vehicle weaknesses

EA888 Evo with 185 kW in the Q5 FY. Powerful turbo petrol with good power delivery. Mature generation with significantly reduced oil consumption.

• !! Timing chain tensioner wear from 100,000 km

  The EA888 Gen.3 (DAXB) can develop chain tensioner and guide rail wear. Cold-start rattling is the early warning sign; in extreme cases chain jump with engine damage is possible.

  Symptoms: Rattling on cold start, rough running during warm-up, engine warning light P0016/P0011
  1,500–3,000 $
  Ad timing chain EA888 Gen3chain tensioner 2.0 TFSI DAXB
• !! Oil consumption from worn piston rings from 120,000 km

  The EA888 shows elevated oil consumption at higher mileage. On the predecessor engine (Gen.1/2 up to 2012) this was a massive problem due to overly narrow oil scraper rings; Gen.3 is improved but not immune.

  Symptoms: Blue smoke during acceleration, dropping oil level between changes, oil smell
  1,500–4,500 $
  Ad piston rings EA888 Gen3oil control ring 2.0 TFSI
• !! DSG gearbox wear at high mileage from 100,000 km

  The S-tronic/DSG gearbox in the Q5 FY is prone to elevated oil consumption and jerky or illogical shift characteristics at high mileage. Regular gearbox oil changes are essential.

  Symptoms: Juddering on take-off or gear change, harsh shift shocks, elevated gearbox oil consumption
  200–2,500 $
  Ad DSG transmission fluid Q5 FYS-tronic oil change 7-Gang

+ 2 more engine weaknesses + vehicle weaknesses

With the B9 generation Audi swapped the supercharger for a twin-scroll turbo — and built in a character compromise. The EA839 runs the Miller cycle with late intake valve closing and 11.2:1 compression, making it more efficient on paper than its predecessor. In practice: a broader rev band (500 Nm from 1,300 to 4,500 rpm), but the immediate supercharger feel is gone. The turbo sits in the hot-V between the cylinder banks — keeping the engine bay compact, but demanding thermally. Known weak points: the oil filter housing in the hot section tends to leak, and the thermostat shares its housing with the water pump — if one fails, both usually get replaced. Misfire on cylinder 6 starts appearing around 100,000 km, often from aged spark plugs or faulty ignition coils. The timing chain sits on the engine side, not the gearbox side — a genuine advantage over some contemporaries.

• !! Rocker Arm Roller Failure (GP0 Production)

  Early CWGD units with P-code GP0 (up to production date 06.08.2018) have poor-quality rocker arm rollers. The small bearing rollers can fall out and end up in the oil sump — camshaft and piston damage possible.

  Symptoms: Combustion misfire, engine fault light, rough running, clattering noise from cylinder head.
  500–3,000 $
  Ad rocker arm CWGD S4 B9 3.0 TFSI 06M109417HSchlepphebel EA839 GP0 0P2109417rocker armrollen S4 B9 CWGD repair
• !! Water Pump Internal Failure with Coolant in Vacuum System from 80,000 km

  The EA839 water pump is vacuum-controlled. On internal failure, coolant enters the vacuum system and spreads to further engine components. The old 4-bolt pulley is the prime suspect — identifiable if original pump still fitted.

  Symptoms: Coolant warning light, coolant loss without external leakage, P0299 (boost pressure too low), 'drivetrain fault', 12V battery no longer charging.
  800–2,000 $
  Ad water pump CWGD S4 B9 EA839 6-Bolzencoolant pump S4 B9 3.0 TFSI repairVakuumventil water pump EA839 CWGD
• !! 48V Mild Hybrid System Fault (from 2019 Facelift)

  The belt starter-generator (BSG) and the 48V battery can fail, especially on vehicles before 2021 without the protective cover over the control unit. Diagnosis and calibration required after replacement.

  Symptoms: '48V system fault' in display, start-stop disabled, no recuperation, rough or delayed starting, limp mode.
  1,500–4,000 $
  Ad 48V RSG CWGD S4 B9 repairRiemenstartergenerator EA839 CWGD Defekt48V battery S4 B9 3.0 TFSI replacement

+ 5 more engine weaknesses + vehicle weaknesses

EA888 evo3 plug-in hybrid with 185 kW combustion engine and 105 kW electric motor. First generation of the Audi TFSI e plug-in hybrids. Watch for PHEV-specific issues with the high-voltage battery and charging electronics.

• !! Recall 93AB/93AD — High-Voltage Battery Overheating

  Defective cell modules in the Samsung SDI high-voltage battery can overheat during charging and in extreme cases cause a vehicle fire. Affects Q5 and A6/A7 TFSI e production years 2019–2024. KBA recall 93AD.

  Symptoms: Warning message in instrument cluster for high-voltage battery; charging process aborts; vehicle refuses external charging; in rare cases smell of burning.
  0–13,000 $
  Ad high-voltage battery Q5 TFSI eHV-battery A6 C8 PHEVZellmodul 14 kWh DLGA
• !! Hybrid Gearbox Failure (S-Tronic 0D8/0D9) from 70,000 km

  The S-Tronic hybrid gearbox shows premature failures on some TFSI e models. The PHEV gearboxes were developed under time pressure, leading to maturity issues on early examples.

  Symptoms: Shift jerk on pull-away; gearbox shifts hesitantly or stays stuck in gear; gearbox fault message in instrument cluster; complete gearbox failure.
  3,000–8,000 $
  Ad S-Tronic Hybridgearbox Q5 TFSI egearbox 0D8 repairMechatronik PHEV Audi Q5
• !! Timing Chain Elongation EA888 evo3 from 120,000 km

  The EA888 evo3 timing chain can elongate excessively from around 100,000–130,000 km with neglected oil maintenance. Rattling on cold start and camshaft fault codes in the ECU are early signs.

  Symptoms: Metallic rattling on cold start that subsides as engine warms up; engine fault codes P0016/P0017 (camshaft-crankshaft synchronisation); in advanced cases power loss.
  800–2,000 $
  Ad timing chain EA888 evo3chain tensioner 2.0 TFSItiming chain kit DLGA

+ 7 more engine weaknesses + vehicle weaknesses

EA888 evo4 plug-in hybrid with 195 kW combustion engine and 105 kW electric motor. Further development of the DLGA with slightly higher engine output and a larger 17.9 kWh battery.

• !! Recall 93AD — high-voltage battery overheating

  The high-voltage battery in DRYA vehicles is affected by the Samsung SDI cell module defect. Overheating can occur during charging. KBA recall 93AD, approximately 17,000 vehicles in Germany.

  Symptoms: High-voltage battery warning; charging stops without apparent reason; Audi recommends avoiding external charging until software update.
  0–13,000 $
  Ad high-voltage battery Q5 TFSI e FaceliftHV-battery A6 C8 DRYAZellmodul 17.9 kWh Audi PHEV
• !! Hybrid gearbox problems S-Tronic from 60,000 km

  The facelift variant's hybrid gearbox shares its fundamental design with the predecessor. Gearbox failures on Q5 and A7 55 TFSI e have been documented from around 20,000–80,000 km.

  Symptoms: Juddering on pull-away; shifting problems between gears; gearbox emergency programme active; fault message in instrument cluster.
  3,000–8,000 $
  Ad Hybridgearbox Audi Q5 TFSI e FaceliftS-Tronic 0D8 repair DRYAMechatronik PHEV A6 C8
• !! Timing chain stretch EA888 evo4 from 130,000 km

  Despite improvements over the evo3, the EA888 evo4 timing chain can show stretch from around 110,000–140,000 km with poor oil maintenance. Rattling on cold start is the first warning.

  Symptoms: Metallic rattling from engine bay on cold start; fault codes P0016/P0017; power fluctuations.
  800–2,000 $
  Ad timing chain EA888 evo4chain tensioner DRYA 2.0 TFSItiming chain kit Q5 FY Facelift

+ 6 more engine weaknesses + vehicle weaknesses

EA888 evo3 plug-in hybrid with 185 kW combustion engine and 105 kW electric motor. First generation of the Audi TFSI e plug-in hybrids. Watch for PHEV-specific issues with the high-voltage battery and charging electronics.

• !! Recall 93AB/93AD — High-Voltage Battery Overheating

  Defective cell modules in the Samsung SDI high-voltage battery can overheat during charging and in extreme cases cause a vehicle fire. Affects Q5 and A6/A7 TFSI e production years 2019–2024. KBA recall 93AD.

  Symptoms: Warning message in instrument cluster for high-voltage battery; charging process aborts; vehicle refuses external charging; in rare cases smell of burning.
  0–13,000 $
  Ad high-voltage battery Q5 TFSI eHV-battery A6 C8 PHEVZellmodul 14 kWh DLGA
• !! Hybrid Gearbox Failure (S-Tronic 0D8/0D9) from 70,000 km

  The S-Tronic hybrid gearbox shows premature failures on some TFSI e models. The PHEV gearboxes were developed under time pressure, leading to maturity issues on early examples.

  Symptoms: Shift jerk on pull-away; gearbox shifts hesitantly or stays stuck in gear; gearbox fault message in instrument cluster; complete gearbox failure.
  3,000–8,000 $
  Ad S-Tronic Hybridgearbox Q5 TFSI egearbox 0D8 repairMechatronik PHEV Audi Q5
• !! Timing Chain Elongation EA888 evo3 from 120,000 km

  The EA888 evo3 timing chain can elongate excessively from around 100,000–130,000 km with neglected oil maintenance. Rattling on cold start and camshaft fault codes in the ECU are early signs.

  Symptoms: Metallic rattling on cold start that subsides as engine warms up; engine fault codes P0016/P0017 (camshaft-crankshaft synchronisation); in advanced cases power loss.
  800–2,000 $
  Ad timing chain EA888 evo3chain tensioner 2.0 TFSItiming chain kit DLGA

+ 7 more engine weaknesses + vehicle weaknesses

EA888 evo4 plug-in hybrid with 195 kW combustion engine and 105 kW electric motor. Further development of the DLGA with slightly higher engine output and a larger 17.9 kWh battery.

• !! Recall 93AD — high-voltage battery overheating

  The high-voltage battery in DRYA vehicles is affected by the Samsung SDI cell module defect. Overheating can occur during charging. KBA recall 93AD, approximately 17,000 vehicles in Germany.

  Symptoms: High-voltage battery warning; charging stops without apparent reason; Audi recommends avoiding external charging until software update.
  0–13,000 $
  Ad high-voltage battery Q5 TFSI e FaceliftHV-battery A6 C8 DRYAZellmodul 17.9 kWh Audi PHEV
• !! Hybrid gearbox problems S-Tronic from 60,000 km

  The facelift variant's hybrid gearbox shares its fundamental design with the predecessor. Gearbox failures on Q5 and A7 55 TFSI e have been documented from around 20,000–80,000 km.

  Symptoms: Juddering on pull-away; shifting problems between gears; gearbox emergency programme active; fault message in instrument cluster.
  3,000–8,000 $
  Ad Hybridgearbox Audi Q5 TFSI e FaceliftS-Tronic 0D8 repair DRYAMechatronik PHEV A6 C8
• !! Timing chain stretch EA888 evo4 from 130,000 km

  Despite improvements over the evo3, the EA888 evo4 timing chain can show stretch from around 110,000–140,000 km with poor oil maintenance. Rattling on cold start is the first warning.

  Symptoms: Metallic rattling from engine bay on cold start; fault codes P0016/P0017; power fluctuations.
  800–2,000 $
  Ad timing chain EA888 evo4chain tensioner DRYA 2.0 TFSItiming chain kit Q5 FY Facelift

+ 6 more engine weaknesses + vehicle weaknesses

With the B9 generation Audi swapped the supercharger for a twin-scroll turbo — and built in a character compromise. The EA839 runs the Miller cycle with late intake valve closing and 11.2:1 compression, making it more efficient on paper than its predecessor. In practice: a broader rev band (500 Nm from 1,300 to 4,500 rpm), but the immediate supercharger feel is gone. The turbo sits in the hot-V between the cylinder banks — keeping the engine bay compact, but demanding thermally. Known weak points: the oil filter housing in the hot section tends to leak, and the thermostat shares its housing with the water pump — if one fails, both usually get replaced. Misfire on cylinder 6 starts appearing around 100,000 km, often from aged spark plugs or faulty ignition coils. The timing chain sits on the engine side, not the gearbox side — a genuine advantage over some contemporaries.

• !! Rocker Arm Roller Failure (GP0 Production)

  Early CWGD units with P-code GP0 (up to production date 06.08.2018) have poor-quality rocker arm rollers. The small bearing rollers can fall out and end up in the oil sump — camshaft and piston damage possible.

  Symptoms: Combustion misfire, engine fault light, rough running, clattering noise from cylinder head.
  500–3,000 $
  Ad rocker arm CWGD S4 B9 3.0 TFSI 06M109417HSchlepphebel EA839 GP0 0P2109417rocker armrollen S4 B9 CWGD repair
• !! Water Pump Internal Failure with Coolant in Vacuum System from 80,000 km

  The EA839 water pump is vacuum-controlled. On internal failure, coolant enters the vacuum system and spreads to further engine components. The old 4-bolt pulley is the prime suspect — identifiable if original pump still fitted.

  Symptoms: Coolant warning light, coolant loss without external leakage, P0299 (boost pressure too low), 'drivetrain fault', 12V battery no longer charging.
  800–2,000 $
  Ad water pump CWGD S4 B9 EA839 6-Bolzencoolant pump S4 B9 3.0 TFSI repairVakuumventil water pump EA839 CWGD
• !! 48V Mild Hybrid System Fault (from 2019 Facelift)

  The belt starter-generator (BSG) and the 48V battery can fail, especially on vehicles before 2021 without the protective cover over the control unit. Diagnosis and calibration required after replacement.

  Symptoms: '48V system fault' in display, start-stop disabled, no recuperation, rough or delayed starting, limp mode.
  1,500–4,000 $
  Ad 48V RSG CWGD S4 B9 repairRiemenstartergenerator EA839 CWGD Defekt48V battery S4 B9 3.0 TFSI replacement

+ 5 more engine weaknesses + vehicle weaknesses