Audi, A6, C4, 2.5 TDI 140 (1994-) Common Issues
1. Rattling Noise from Exhaust
Occurrence: 15%Cost to repair: $200Symptoms:
A rattling or humming noise coming from the exhaust system
2. Oil Leaks
Occurrence: 12%Cost to repair: $300Symptoms:
Visible signs of oil droplets on the ground or underneath the car
3. Faulty Oxygen Sensor
Occurrence: 18%Cost to repair: $450Symptoms:
Erratic engine performance, reduced power and poor fuel efficiency
4. Transmission Slipping
Occurrence: 8%Cost to repair: $700Symptoms:
Noticeable slipping or hesitation when shifting gears
5. Electrical Issues with Instruments (e.g. Speedo)
Occurrence: 10%Cost to repair: $600Symptoms:
Instruments not functioning correctly or displaying incorrect readings
6. Rust Spots on Body Panels
Occurrence: 6%Cost to repair: $1000Symptoms:
Visible signs of rust spots on the body panels, especially in areas prone to moisture accumulation
7. Faulty Air Suspension
Occurrence: 9%Cost to repair: $800Symptoms:
Unstable or uneven ride height, noise from air suspension system
8. Engine Knock/Low Compression Issues
Occurrence: 7%Cost to repair: $1200Symptoms:
Knocking or tapping noises coming from the engine area, poor engine performance and low compression readings
9. Faulty Rear Differential
Occurrence: 5%Cost to repair: $900Symptoms:
Grinding or clunking noise coming from the rear differential area
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