Audi S7
Audi 3.0 TDI V6 with 344 PS (253 kW) in the S6 C8 and S7 C8. Mild hybrid system with 48V belt starter-generator. Electric compressor for instant boost pressure. Very powerful diesel sports engine with low consumption around 7L/100km.
V6 S7 — same V8-shaped hole, now in a Sportback
Same V6+48V controversy as the S6 C8, wrapped in a Sportback body. The prettier shell can't mask the V8 void. Love the silhouette but need the V8 sound: buy a used C7, not a new C8.
Engine Weaknesses 5
In the 3.0 TDI EA897 camshafts fracture due to material defects — affecting all four camshafts of the V6. A fracture inevitably causes engine damage. Audi acknowledged the issue via TPI 2043172.
Symptoms: Ticking or knocking engine noises beyond normal diesel sounds, then power loss and engine failure
The 3.0 TDI is prone to timing chain elongation and tensioner wear. A chain jump causes pistons and valves to collide, causing total engine damage. Replacement requires 15–20 labour hours.
Symptoms: Rattling or knocking on cold start and under load, engine stumbling, warning light
Diesel-typical soot formation on the 3.0 TDI injectors leads to injection problems and increased wear. Fuel additives and premium diesel can delay the need for cleaning.
Symptoms: Rough idle, increased consumption, hesitation under load, power loss at higher rpm
The 3.0 TDI dual-mass flywheel wears faster under high torque, especially with frequent city driving and low-rpm operation. Replacement is cost-intensive.
Symptoms: Dull clunking noises on take-off and gear changes, vibrations at idle, rough running when lifting off the throttle
The 3.0 TDI diesel particulate filter clogs with frequent short-trip use as the regeneration temperature is not reached. After software updates the DPF loading was sometimes increased.
Symptoms: Power loss, increased consumption, limp mode, DPF warning light, increased oil dilution smell
Vehicle Weaknesses 5
A7 4K models 2020–2021: nuts on rear axle control arms do not meet specification. If they fracture, the rear axle can break away uncontrollably.
53,449 vehicles A6/A7/Q5 produced 2019–2024: cell modules in the 48V battery can overheat during charging and cause a fire risk.
On the optional adaptive suspension, servo actuators inside the dampers can fail due to moisture ingress. The damper must be replaced as a complete unit.
The complex MMI system crashes or displays spurious warnings. Incorrect lighting system errors and driver assistance faults are known.
The elaborate electrical system with numerous driver assistance systems puts heavy demands on the 12V battery. Early failure especially on short-run use.
Reports & Tests
44 owner complaints filed with NHTSA (2018–2024). Most reported: Electrical (26), Engine (9), Powertrain (8).