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Audi , A6 , C5 , 4.2 V8 Quattro (1999-) Common Issues

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  1. Faulty Oxygen sensors (highly frequent)
  2. Issues with the Electronic Throttle Control system (ETCS) (frequent)
  3. Coolant leaks and related problems (very frequent)
  4. Transmission solenoid pack failures (frequent)
  5. Rear Main Seal (RMS) leak (very frequent)
  6. Fuel injector issues (highly frequent)
  7. Spark plug wire failures (frequent)
  8. EGR valve cloggage (very frequent)
  9. PCV system problems (frequent)
  10. Alternator failure (highly frequent)
  11. Power steering pump malfunction (rare)
  12. Faulty fuel pressure regulator (rare)
  13. Clogged catalytic converters (uncommon)
  14. Vacuum leaks (uncommon)
  15. Ignition coil failures (uncommon)
  16. Water in the transmission cooler lines (rare)
  17. Cracked or broken timing cover (very rare)
  18. Engine block cracks (extremely rare)
  19. Transmission failure due to worn clutch packs and gears (extremely rare)
  20. Electronic stability control (ESC) module failure (extremely rare)
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