Audi A8
V6 diesel with 210 kW and 48V mild hybrid. Most powerful V6 diesel in the Audi range. Excellent long-distance engine with abundant torque.
Capable multi-cylinder — relaxed touring
286 hp 3.0L with pleasant refinement. Relaxed motorway cruiser, no sporting pretensions. Factor in known weak points.
Engine Weaknesses 5
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.
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.
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.
DPF clogs on short trips because regeneration temperature is never reached. Expensive cleaning or replacement required.
Symptoms: Power loss, engine warning light, limp mode, increased fuel consumption
Mandatory recall due to unlawful defeat device in the 3.0 TDI engine. Software update alters shift points and regeneration behaviour. No driver cost, but must be documented.
Vehicle Weaknesses 6
A contact fault in the seat heating cable can cause the passenger occupant detection system (PODS) to detect a malfunction and deactivate the passenger airbag. Affects A8 model years 2017–2020. Free repair at dealer.
High-voltage battery cell modules can overheat during charging, in extreme cases causing a vehicle fire. KBA action 93QQ, production period 08/2019–07/2024. Solution: software update with improved temperature monitoring and charge current limiting.
The adaptive air suspension on the A8 D5 shows weaknesses from 100,000–150,000 km: rear air bellows become porous, the compressor overheats from continuous running when bellows leak. Cold temperatures worsen the sealing of the rubber membranes.
The 48-volt electrical system of the A8 D5 can produce charging faults on the lithium-ion buffer battery. When it fails, numerous warnings appear on the instrument cluster (assistance systems unavailable, steering, engine shutdown warning). Replacement is expensive.
The rubberised soft-touch surfaces on light switches, trim panels and door inner handles peel off on virtually all vehicles with age. A sticky, greasy surface develops especially on frequently touched areas.
The digital instrument cluster (Virtual Cockpit) occasionally freezes and the navigation map stops updating. 2021 models were recalled due to a hardware fault in the connection cable (software solution). Older models are mostly resolved through software updates.
Reports & Tests
7 owner complaints filed with NHTSA (2017–2024). Most reported: Electrical (3), Powertrain (3), Engine (2).