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Audi , A6 , C5 , 2.5 TDI (1997-) Common Issues

  1. Faulty Diesel Particulate Filter (DPF)
  2. EGR valve problems
  3. Oil leaks due to worn piston rings or cylinder head gasket
  4. Low compression on one or more cylinders
  5. Faulty Mass Air Flow (MAF) sensor
  6. Ignition coil failure
  7. Fuel filter clogging
  8. Coolant leakages from the water pump, radiator hoses or engine block
  9. Timing belt tensioner failure
  10. Crankshaft position sensor issues
  11. Throttle body problems
  12. Faulty oxygen sensor (O2S)
  13. Worn or loose serpentine belt
  14. Engine oil consumption due to worn piston rings or cylinder head gasket
  15. Turbocharger failure
  16. Faulty electronic throttle control (ETC) module
  17. Air leakage into the crankcase
  18. Spark plug wire and boot issues
  19. PCV system clogging
  20. Water pump failure
  21. Alternator belt failure
  22. Ignition timing problems
  23. Fuel pump failure
  24. Throttle valve sticking or jamming
  25. Electronic engine control unit (ECU) software glitches
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