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Audi , A6 , C4 , S6 4.2 Avant Plus (1996-) Common Issues

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  1. Water ingress through sunroof or rear window
  2. Faulty alternator and starter motor bearings
  3. Timing belt failure at high mileage
  4. Rear differential bearing wear
  5. Coil pack and ignition module problems
  6. Coolant leak from head gasket area
  7. Turbocharger issues in the 2.9L V6 engine (not applicable to 4.2L)
  8. Front subframe corrosion and rust spots
  9. Gearbox oil leaks
  10. Faulty ECU and faulty oxygen sensor
  11. Air suspension system failure
  12. ABS pump bearing wear
  13. Rear main seal leak
  14. Engine mounts failure and associated vibrations
  15. Fuel injectors and fuel pressure regulator problems
  16. Head gasket replacement required at high mileage
  17. Intake manifold and throttle body issues
  18. Engine oil leaks from valve cover and oil drain plug area
  19. Electronic control module (ECU) software issues and faulty engine management lights
  20. Air conditioning system faults, including refrigerant leaks and compressor failure
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