Audi S7
EA839 BiTurbo V6 with 331 kW for S6/S7 C8. Switch from V8 to V6 compared to the predecessor, but with 48V mild hybrid and electric compressor, performance is nearly identical.
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
Small roller bearings in the rocker arms can detach and fall into the oil pan. Affects 2.9 BiTurbo engines from early production (up to approx. 2019, code GP0). Revised rocker arms (GP1) introduced from 2017.
Symptoms: Knocking noises from cylinder head, engine roughness, misfires, metal particles in the oil
The upper timing chain tensioners of the 2.9 TFSI tend to weaken. Typical rattling on cold start that disappears after warm-up. Audi revised the tensioners; goodwill repair often possible.
Symptoms: Rattling on cold start (2,000–3,000 rpm), disappears after warm-up
The DCTB 2.5 TFSI Evo (RS3 8Y, 400 hp) shows early high-pressure pump failure on some examples. Power loss and misfires are typical symptoms.
Symptoms: Power loss under high load, rough running, fault code fuel pressure control, increased fuel consumption.
Direct injection without port injection leads to carbon deposits on intake valves. Power loss and increased consumption from around 80,000 km. Walnut blasting required.
Symptoms: Power loss, rough idle, increased consumption, poor cold-start response
BiTurbo wastegate linkage rods can wear and produce metallic rattling on overrun. Known on the EA839 BiTurbo. Repair often only possible by replacing the turbocharger.
Symptoms: Metallic clattering when lifting off throttle, especially during spirited and motorway driving
Vehicle Weaknesses 4
On the S7 4K, defective ride height sensors in the air suspension are reported, causing system fault messages. Usually individual sensors that need replacing.
The 48V mild-hybrid system with belt-driven starter-generator is a potential weak point in the S7 4K. Audi granted a 7-year extended warranty on the BSG, which is telling.
S7 4K drivers report sporadic fault messages from driver assistance systems, gearbox faults and drivetrain warnings, particularly at speeds above 180 km/h. Software updates resolve many issues.
The S7 4K's braking system is sized for 450 hp and dimensioned accordingly. Front brake disc and pad replacement is expensive.
Reports & Tests
6 owner complaints filed with NHTSA (2019–2024). Most reported: Electrical (5), Powertrain (2), Steering (1).