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Audi , A6 , C4 , S6 (1994-) Common Issues

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  1. Crankshaft position sensor failure
  2. Oxygen sensor problems
  3. Faulty ignition coils
  4. Coolant leaks from water pump seals or hoses
  5. Rear main seal oil leak
  6. Transmission solenoid pack failure
  7. Fuel system clog due to sediment in fuel tank
  8. PCV valve failure, causing engine oil consumption
  9. Vacuum leak from intake manifold gasket or cylinder head
  10. Engine mount failure, causing engine vibration and noise
  11. Rear wheel bearing wear, causing uneven tire wear and vibration
  12. Brake master cylinder failure, causing brake pedal softness
  13. ABS system malfunction, causing warning lights to illuminate
  14. ECU (Engine Control Unit) reflash failure or incorrect calibration
  15. Air mass flow sensor failure, affecting engine performance and fuel efficiency
  16. Rear differential bearing wear, causing vibration and noise during acceleration
  17. Electronic throttle control system failure, causing uneven idle speed
  18. Automatic transmission solenoid pack malfunction, causing slipping or hesitation
  19. Fuel injector clog or dirty nozzles, reducing engine performance and fuel efficiency
  20. Power steering pump leakage or bearing failure
  21. Air conditioning compressor clutch failure
  22. Rear axle joint wear, causing vibration during cornering
  23. Brake caliper or rotor warping, affecting brake performance
  24. Body control module (BCM) failure, causing warning lights to illuminate
  25. Electronic stability program (ESP) system malfunction, affecting vehicle stability
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