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Audi , A6 , C4 , S6 Avant 4.2 Quattro (1994-) Common Issues

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  1. Faulty oxygen sensor
  2. Worn or loose timing belt
  3. Issues with ABS hydraulic system
  4. Transmission solenoid pack failure
  5. Rear main seal leak
  6. Water pump failure
  7. Coolant leaks due to faulty head gasket
  8. Intermittent starting problems caused by dirty or faulty crankshaft position sensor
  9. Air leaks in the intake manifold
  10. PCV system clogs and vacuum leaks
  11. Problems with VTEC (Variable Timed Exhaust Camshaft) solenoids
  12. DTC P1413, P1613 or P1614 error codes related to EGR valve issues
  13. Issues with the Electronic Throttle Control System (ETCS)
  14. Loss of power and stalling caused by faulty TPS (Throttle Position Sensor)
  15. DTC P0117 or P0118 error codes due to intake air temperature sensor failure
  16. Fuel pressure regulator problems causing stalling
  17. Engine oil leaks from the valve cover gasket area
  18. Issues with the Automatic Stop/Start System (if equipped)
  19. Faulty SRS (Supplemental Restraint System) sensors and modules
  20. Rear tail light lens or reflector damage
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