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

  1. Faulty Oxygen Sensor: Worn or faulty oxygen sensors can cause a rich/fuel-starved condition, leading to poor engine performance and reduced fuel efficiency.
  2. Camshaft Position Sensor Failure: The camshaft position sensor failure can lead to intermittent stalling, rough idling, and poor engine performance.
  3. Faulty Fuel Pressure Regulator: A faulty fuel pressure regulator can cause a lean/rich running condition, resulting in decreased performance and increased emissions.
  4. Transmission Solenoid Pack Issues: Worn or faulty solenoids in the transmission pack can lead to erratic shifting patterns, slipping gears, and potential damage to the transmission.
  5. Vacuum Leaks: Vacuum leaks from hoses, connections, or intake manifold gaskets can cause a loss of power, rough idling, and poor engine performance.
  6. Faulty Crankshaft Position Sensor (CKP): A faulty CKP sensor can lead to intermittent stalling, rough idling, and poor engine performance.
  7. Fuel Injector Issues: Clogged or dirty fuel injectors can cause a lean/rich running condition, resulting in decreased performance and increased emissions.
  8. Faulty EGR System: A clogged or faulty EGR system can cause a rich/fuel-starved condition, leading to poor engine performance and reduced fuel efficiency.
  9. Rear Main Seal Failure: Rear main seal failure can result in oil leaks from the rear main bearing area.
  10. Engine Bearing Noise: Engine bearing noise is often caused by worn or loose bearings within the 4.2-liter V8 engine.
  11. Cylinder Head Issues: Overheating or damaged cylinder heads can cause a loss of power, overheating, and potential engine failure.
  12. Faulty Ignition Coils: Worn or faulty ignition coils can cause a weak spark, resulting in poor engine performance and decreased fuel efficiency.
  13. Timing Chain Guide Failure: A failed timing chain guide can cause the timing chain to jump teeth, leading to engine failure.
  14. PCV System Clogs: A clogged PCV (Positive Crankcase Ventilation) system can cause a loss of power, overheating, and potential engine damage.
  15. Fuel Pump Failure: A faulty fuel pump can result in a lack of fuel pressure, causing the engine to stall or not start at all.
  16. Crankshaft Pulley Failure: A failed crankshaft pulley can cause the serpentine belt to break, resulting in loss of power steering and alternator function.
  17. Rear Differential Bearing Failure: Rear differential bearing failure can result in a loud grinding noise when making sharp turns or accelerating.
  18. Electronic Throttle Control (ETC) Issues: A faulty ETC system can cause the throttle to stick or fail to respond properly, resulting in erratic engine performance.
  19. Faulty 4-Light Sensor: The 4-light sensor failure can lead to issues with the automatic headlight dimming function and potential damage to the wiring harness.
  20. Rare Issues:
  • Faulty air suspension system
  • Worn or damaged brake rotors
  • Master cylinder failure
  • ABS pump failure
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