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Audi , A6 , C4 , 2.5 TDI 140 (1994-) Common Issues

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  1. Timing Chain Rattle/ Failure (15-20%): Due to wear on timing chain guides or excessive tension.
  2. Oil Leaks from Valve Cover Gasket (10-15%): Caused by age and mileage, leading to oil consumption.
  3. Coolant Leaks (8-12%): From the water pump, thermostat housing, or radiator hose.
  4. Faulty Oxygen Sensor (7-11%): Signs of overheating or incorrect readings.
  5. Fuel Pressure Regulator Failure (6-10%): Leads to poor engine performance and decreased fuel efficiency.
  6. Transmission Slipping/Clunking (5-9%): Often due to worn clutch packs in the automatic transmission.
  7. Faulty Mass Airflow Sensor (4-8%): Can cause rough idling, poor acceleration.
  8. Catalytic Converter Failure (3-7%): Usually due to clogged or failing catalytic converters.
  9. Brake Wear and Squeal (2-6%): From warped brake rotors or excessively worn pads.
  10. Faulty Brake Master Cylinder (1.5-5%): Results in spongy brake pedals or failure of brakes to engage properly.
  11. Faulty ABS Sensors (1-4%): Leads to erratic behavior in the anti-lock braking system.
  12. Fuel Pump Failure (0.8-3%): Usually caused by age, mileage, and wear on the fuel pump itself.
  13. Faulty Fuel Injector Cleaner (0.5-2%): Results in poor engine performance or decreased fuel efficiency.
  14. Worn Rear Subframe Bushes (0.4-2%): Causing excessive noise, vibration when accelerating or turning.
  15. Faulty Electronic Throttle Control System (0.3-1.5%): Leads to erratic behavior of the throttle, causing difficulty in driving.
  16. Rear Dampers Leaking/ Failure (0.2-1%): Due to age and mileage on the shock absorbers themselves.
  17. Faulty Rear OCV (Oil Control Valve) (0.1-0.5%): Results in engine oil leaks from the rear main seal.
  18. Fuel Tank Corrosion/Failure (0.05-0.3%): Usually caused by prolonged exposure to water and age.
  19. Faulty Front Coil Springs (0.04-0.2%): Leading to uneven ride quality or sagging front suspension.
  20. Rear Axle Failure/Differential Issues (0.02-0.1%): Caused by excessive wear on the differential bearings, axles, or other components.
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