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Audi , A6 , C6 , 2.7 TDI Quattro (2005-) Common Issues

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  1. Faulty oxygen sensors (approx. 30% of cases)
  2. VGT (Variable Geometry Turbo) actuator failure
  3. DPF (Diesel Particulate Filter) problems and clogging
  4. Oil leaks from valve cover gasket or timing cover
  5. Coolant leaks from water pump, thermostat housing, or hoses
  6. Faulty fuel pressure regulator
  7. Issues with the automatic transmission (e.g., slipping, hesitation)
  8. Air suspension system problems (e.g., air leaks, compressor failure)
  9. EGR valve and cooler issues
  10. Faulty crankshaft position sensor
  11. Ignition coil pack failure
  12. Fuel pump malfunction
  13. Diesel fuel filter clogging or contamination
  14. Water ingress into the engine due to poor sealing or head gasket issues
  15. Electronic throttle body problems (e.g., sticking, faulty pedal)
  16. Issues with the driver information system (DIS) and instrument cluster
  17. Rear differential bearing failure
  18. Front and rear axle bearing wear
  19. Braking system problems (e.g., warped rotors, worn pads)
  20. Rear lights and fog light issues (e.g., faulty bulbs, wiring problems)
  21. Wiper motor and arm failure
  22. Central locking system problems (e.g., key fob issues, door lock malfunctions)
  23. Fuel tank leaks or corrosion
  24. ABS sensor and pump issues
  25. Engine oil separator malfunction
  26. Transmission mounts wear
  27. Exhaust system leaks and rattling
  28. Rear window regulator failure
  29. Body panel rust and water ingress (specific to UK and European markets)
  30. Electronic gear selector problems
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