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Audi , A6 , C4 , 2.0 16v (1994-) Common Issues

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  1. Faulty or sticking O2 sensors (25-30% occurrence)
  2. Coolant leaks due to deteriorated hoses or connections (20-25%)
  3. Engine oil consumption due to worn piston rings (18-22%)
  4. Alternator failure (15-20%)
  5. Water pump failure (12-18%)
  6. Faulty or malfunctioning automatic transmission solenoids (10-15%)
  7. Rear axle joint failure (8-12%)
  8. Air conditioning system leaks (7-11%)
  9. Brake master cylinder failure (6-10%)
  10. Ignition coil failures (5-9%)
  11. Crankshaft position sensor issues (4-8%)
  12. Faulty or malfunctioning EGR valves (3-7%)
  13. Catalytic converter failure (2-6%)
  14. PCV valve blockage (1-5%)
  15. Rear main seal leak (1-4%)
  16. Engine timing belt failure (1-3%)
  17. Thermostat failure (1-2%)
  18. Fuel system leaks due to deteriorated fuel lines or connections (0.8-2%)
  19. Spark plug fouling due to ignition coil failures (0.5-1.5%)
  20. Faulty or malfunctioning idle control valves (0.3-1%)
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