Audi S7 4G

Biturbo V8 with 309 kW for S6/S7 C7 and S8 D4. Detuned version of the RS V8 with cylinder deactivation. Comfortable and powerful at the same time.

• !! Recall 21H7 — Oil Strainer Turbocharger Supply from 60,000 km

  KBA recall (code 21H7) for S6 and RS6 built June 2012 to March 2017: the too-fine oil strainer restricts turbocharger lubrication. Replacement with a coarser-mesh strainer required. Without repair, turbo damage can result.

  Symptoms: Power loss, whistling turbo noise, engine check light; in advanced cases metallic swarf in oil
  0–500 $
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• !! Timing Chain Stretch — V8 BiTurbo from 170,000 km

  At high mileages (150,000–200,000 km) 4.0 TFSI engines show timing chain stretch, recognisable by camshaft synchronisation faults. Repair requires extensive engine work on the V8.

  Symptoms: Idle fluctuations, camshaft synchronisation fault codes, rattling on cold start from the front timing drive
  3,000–8,000 $
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• !! High-Pressure Fuel Pump — Wear from 140,000 km

  The high-pressure fuel pump on the 4.0 TFSI is a known wear component. Pressure loss causes injection problems and uneven combustion. Wear increases with long service intervals or poor fuel quality.

  Symptoms: Rough running, injection noise, power loss at high rpm, cold-start problems
  800–2,500 $
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+ 7 more engine weaknesses + vehicle weaknesses