Audi, A6, C4, 2.6 (1994-) Common Issues
1. Timing Chain Tensioner Failure
Occurrence: 20%Cost to repair: $800Symptoms:
Rattling or knocking sound from the engine, especially when accelerating
2. Coolant Leak
Occurrence: 15%Cost to repair: $300Symptoms:
Green or yellow coolant on the ground under the car, low coolant level in the reservoir
3. Faulty Mass Airflow Sensor
Occurrence: 12%Cost to repair: $200Symptoms:
Poor engine performance, rough idling, or stalling
4. Bad Rear Main Seal
Occurrence: 18%Cost to repair: $600Symptoms:
Oil leaks on the rear main bearing area, oil spots on the garage floor
5. Faulty Oxygen Sensor
Occurrence: 10%Cost to repair: $150Symptoms:
Poor engine performance, rough idling, or stalling
6. Worn out Rear Suspension Bushes
Occurrence: 12%Cost to repair: $400Symptoms:
Clunking or knocking sound from the rear of the car when driving over bumps
7. Faulty Automatic Transmission Solenoid
Occurrence: 8%Cost to repair: $900Symptoms:
Slipping or hesitation between gears, unusual noises from the transmission
8. Clogged Diesel Particulate Filter (DPF)
Occurrence: 15%Cost to repair: $1200Symptoms:
Increased engine RPM when idling, illuminated check engine light
9. Faulty EGR Valve
Occurrence: 9%Cost to repair: $180Symptoms:
Poor engine performance, rough idling, or stalling
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