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Audi , A6 , C5 , 2.7 Turbo (1999-) Common Issues

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  1. Faulty Mass Airflow Sensor (MAS) ($500-$1000)
  2. Clogged or dirty throttle body and intake valves ($300-$700)
  3. Fuel Pressure Regulator (FPR) failure ($400-$900)
  4. Vacuum leaks around the intake manifold gasket or connections ($200-$600)
  5. Faulty or corroded spark plug wires and boots ($150-$400)
  6. Clogged or faulty PCV system components ($100-$300)
  7. Engine oil leak from front main seal or valve cover gaskets ($50-$200)
  8. Faulty coolant temperature sensor (CTS) ($100-$300)
  9. Intermittent idle issues due to faulty crankshaft position sensor (CKP) ($150-$400)
  10. Rough engine performance caused by worn piston rings or cylinder walls ($800-$1800)
  11. Clogged or faulty catalytic converter ($500-$1200)
  12. Faulty or corroded battery connections and terminals ($50-$200)
  13. Transmission solenoid pack failure (automatic transmission) ($1000-$2500)
  14. Worn or loose serpentine belt and tensioner ($50-$200)
  15. Overheating due to faulty thermostat, radiator cap, or cooling system leaks ($300-$800)
  16. Engine mechanical noise caused by worn engine bearings or timing chain issues ($500-$1500)
  17. Intermittent stalling or hesitation due to faulty fuel injectors ($100-$300 each)
  18. Air leak around the air mass sensor (LADA) housing ($200-$600)
  19. Faulty Electronic Throttle Control (ETC) system ($800-$1800)
  20. Rare issues:
    • Engine knocking or pinging caused by low compression and faulty PCV system components
    • Worn or damaged cylinder head gaskets
    • Intake manifold vacuum leaks or cracks
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