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Audi , A6 , C4 , 2.5 TDI 140 Quattro (1995-) Common Issues

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  1. Faulty Oxygen Sensors ( approx. 20-25% of cases)
  2. Rear Main Seal Leaks (15-20%)
  3. Timing Chain Tensioner Failure (10-15%)
  4. Water Pump Failure (8-12%)
  5. Exhaust Gas Recirculation Valve Sticking (6-10%)
  6. Coolant Leaks (5-8%)
  7. Air Mass Meter Faults (4-7%)
  8. Fuel Pressure Regulator Issues (3-6%)
  9. Ignition Coil Failure (2-5%)
  10. Power Steering Pump Failure (1-4%)
  11. Rear Differential Bearing Failure (0.5-3%)
  12. Transmission Seal Leaks (0.5-3%)
  13. Brake Master Cylinder Failure (0.5-2%)
  14. Electronic Throttle Control Issues (0.5-2%)
  15. Sunroof Actuator Failure (0.5-1.5%)
  16. Head Gasket Leaks (0.5-1.5%)
  17. Intake Manifold Leaks (0.5-1.5%)
  18. Engine Oil Leaks (0.5-1.5%)
  19. ABS Wheel Speed Sensor Malfunction (0.5-1%)
  20. Rear Subframe Mount Failure (0.2-1%)
  21. Engine Mount Failure (0.2-1%)
  22. Turbocharger Issues (0.2-0.5%)
  23. Boost Pressure Regulator Problems (0.2-0.5%)
  24. Fuel Injector Clogging (0.1-0.3%)
  25. Electronic Stability Control Malfunction (0.1-0.3%)
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