Audi A8 D5

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 $
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+ 2 more engine weaknesses + vehicle weaknesses

EA839 turbo V6 with 250 kW and 48V mild hybrid. Successor to the supercharged V6, now with exhaust turbocharger. Very refined and powerful engine.

• !! Water Pump Internal Failure with Coolant in Vacuum System from 80,000 km

  The EA839 DLZA (A6 C8, A7 4K, A8 D5) shares the known water pump weakness. Vacuum-controlled pump failure allows coolant to migrate into the vacuum system. Critical: 4-bolt pump still original, 6-bolt = already replaced.

  Symptoms: Coolant warning light, coolant loss, P0299, 'drivetrain fault', start-stop disabled.
  800–2,000 $
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• !! Rocker Arm Roller Failure — Early Production

  Early EA839 variants with poor-quality rocker arm rollers (GP0) are also possible in the DLZA. Rollers can fall out and cause camshaft and piston damage.

  Symptoms: Combustion misfire, knocking from cylinder head, engine fault light, rough running.
  500–3,000 $
  Ad rocker arm DLZA A6 C8 EA839 3.0 TFSISchlepphebel A7 4K 3.0 TFSI 250 kW 0P2109417rocker armrollen replacement A8 D5 EA839 DLZA
• !! 48V Mild Hybrid Belt Starter-Generator Failure

  The DLZA is fitted with a 48V MHEV. The belt starter-generator (BSG) and the 48V lithium-ion battery can fail. Control units before 2021 without moisture protection are vulnerable.

  Symptoms: '48V system fault', rough starting, no recuperation, start-stop disabled, limp mode.
  1,500–4,000 $
  Ad 48V RSG DLZA A6 C8 3.0 TFSI replacementRiemenstartergenerator EA839 DLZA A7 4K48V battery A8 D5 3.0 TFSI DLZA Defekt

+ 4 more engine weaknesses + vehicle weaknesses

Biturbo V8 with 338 kW and 48V mild hybrid in the A8 D5. Flagship petrol engine with cylinder deactivation and electric compressor. Exceptionally refined.

• !! Recall 21H7 — Turbo Oil Strainer Clogged (D5)

  Recall (campaign 21H7): oil strainer in the 4.0 TFSI V8 turbo oil supply clogs with carbon deposits. Affects 2013–2017 models. Vehicles from March 2017 have an improved strainer with coarser mesh.

  Symptoms: Sudden engine stall during driving, engine does not restart after standstill, engine warning light, rough idle
  0–0 $
  Ad Ölsieb Turbo 4.0 TFSIoil strainer DDTA 079103175G
• !! Twin Turbo Damage — 4.0 V8 from 130,000 km

  The twin turbos of the 4.0 TFSI DDTA can fail completely from oil starvation (oil strainer) or bearing wear. Repair costs €8,000–11,000 at Audi. Preventive measures: shorter than manufacturer oil change intervals, let engine idle after motorway driving.

  Symptoms: Massive power loss, strong whistling or grinding, heavy oil consumption, blue smoke when accelerating
  3,000–11,000 $
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• !! Camshaft Scuffing from 150,000 km

  Like the CEUA, the DDTA also shows camshaft scuffing. The camshafts matched to the cylinder heads cannot be freely exchanged, making repairs complex.

  Symptoms: Tapping noises from the valvetrain, rough running at low rpm, power loss
  2,000–6,000 $
  Ad camshaft 4.0 TFSI V8camshaft DDTA

+ 2 more engine weaknesses + vehicle weaknesses

EA839 V6 plug-in hybrid with 250 kW combustion engine and 100 kW electric motor for the A8 D5. Identical V6 to the DCBE, but with a larger battery (17.9 kWh) and more sophisticated integration into the executive saloon.

• !! Water pump failure — EA839 (A8) from 100,000 km

  The structural weakness of the EA839 water pump is also present in the CZSE in the A8. If the pump fails, coolant can be drawn into the vacuum system and cause severe consequential damage.

  Symptoms: Coolant level drops without external leak; P0299 fault code; overheating warning; engine limp mode.
  1,500–4,000 $
  Ad water pump EA839 A8 D5coolant pump 3.0 TFSI CZSE
• !! Recall 93QQ — high-voltage battery fire risk (A8)

  The A8 D5 TFSI e high-voltage battery is part of recall 93QQ (production years 08/2019–07/2024). Defective cell modules can overheat during charging.

  Symptoms: High-voltage battery warning message; charging process aborted; Audi advises not to charge externally until the update is applied.
  0–18,000 $
  Ad high-voltage battery A8 D5 PHEVHV-battery CZSE Audi
• !! Hybrid transmission failure — V6 A8 from 80,000 km

  The A8 D5 TFSI e hybrid transmission is the same unit as in the Q7/Q8. Mechatronics failures and clutch disc wear are known weak points.

  Symptoms: Juddering on take-off; shift delays; gearbox fault message; vehicle enters limp mode.
  4,000–10,000 $
  Ad Hybridgearbox A8 D5 TFSI egearbox CZSE repair

+ 6 more engine weaknesses + vehicle weaknesses

EA839 V6 plug-in hybrid with 250 kW combustion engine and 100 kW electric motor for the A8 D5. Identical V6 to the DCBE, but with a larger battery (17.9 kWh) and more sophisticated integration into the executive saloon.

• !! Water pump failure — EA839 (A8) from 100,000 km

  The structural weakness of the EA839 water pump is also present in the CZSE in the A8. If the pump fails, coolant can be drawn into the vacuum system and cause severe consequential damage.

  Symptoms: Coolant level drops without external leak; P0299 fault code; overheating warning; engine limp mode.
  1,500–4,000 $
  Ad water pump EA839 A8 D5coolant pump 3.0 TFSI CZSE
• !! Recall 93QQ — high-voltage battery fire risk (A8)

  The A8 D5 TFSI e high-voltage battery is part of recall 93QQ (production years 08/2019–07/2024). Defective cell modules can overheat during charging.

  Symptoms: High-voltage battery warning message; charging process aborted; Audi advises not to charge externally until the update is applied.
  0–18,000 $
  Ad high-voltage battery A8 D5 PHEVHV-battery CZSE Audi
• !! Hybrid transmission failure — V6 A8 from 80,000 km

  The A8 D5 TFSI e hybrid transmission is the same unit as in the Q7/Q8. Mechatronics failures and clutch disc wear are known weak points.

  Symptoms: Juddering on take-off; shift delays; gearbox fault message; vehicle enters limp mode.
  4,000–10,000 $
  Ad Hybridgearbox A8 D5 TFSI egearbox CZSE repair

+ 6 more engine weaknesses + vehicle weaknesses

Biturbo V8 with 420 kW and 48V mild hybrid in the S8 D5. Flagship engine with cylinder deactivation and enormous power delivery. Luxury and performance combined.

• !! Oil Strainer Clogging Leads to Turbocharger Damage from 120,000 km

  The oil strainer inside the engine clogs and cuts off the turbocharger lubricating oil supply. Vehicles fail without warning. In the US, 58 official complaints were registered.

  Symptoms: Sudden engine shutdown without warning, power reduction, turbo noises
  3,000–15,000 $
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• !! Charge Air Hoses Leaking from 80,000 km

  The high boost pressures of the BiTurbo configuration heavily stress charge air hoses and seals. Leaks cause power loss up to limp mode.

  Symptoms: Power dip, engine stumbling under load, noticeable limp mode, whistling noises from the engine bay
  200–800 $
  Ad Ladeluftschlauch 4.0 TFSIintercooler gasket V8 BiTurbo
• !! High-Pressure Pump Wear from 130,000 km

  Hitachi high-pressure pumps wear on the tappet rods. Improved tappet rods were introduced as a replacement part. A pump failure manifests as starting problems and rough running.

  Symptoms: Difficult starting, rough engine running, power loss especially at higher rpm
  800–1,800 $
  Ad high-pressure fuel pump 4.0 TFSIhigh-pressure fuel pump V8 BiTurbo

+ 6 more engine weaknesses + vehicle weaknesses