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Audi , A6 , C4 , 2.5 TDI (1994-) Common Issues

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  1. Leaking oil seals or gaskets
  2. Faulty oxygen sensor
  3. Problems with automatic transmission solenoids
  4. Oil consumption due to worn piston rings
  5. Intermittent misfires and poor engine performance
  6. Issues with the 100kph limiter and/or VTEC system
  7. Worn or loose belt driven accessories (e.g., alternator, A/C)
  8. Coolant leaks around the engine block or cylinder head
  9. Faulty EGR valve or faulty vacuum hoses to it
  10. Issues with the fuel pressure regulator
  11. Oil leaks from the valve cover gasket
  12. Problems with the front upper control arm and lower control arm bushings
  13. Worn or broken CV joint boots on rear axles
  14. Cracked engine mounts and/or worn shock absorbers
  15. Clogged DPF (if equipped)
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