Audi, A6, C4, S6 Avant 4.2 Quattro (1994-) Common Issues
1. Faulty oxygen sensor
Occurrence: 12%Cost to repair: $300Symptoms:
Poor engine performance, decreased fuel efficiency
2. Water pump failure
Occurrence: 9%Cost to repair: $800Symptoms:
Leaks under the hood, overheating engine
3. Vacuum leak
Occurrence: 15%Cost to repair: $250Symptoms:
Idling issues, difficulty starting engine
4. Faulty Mass Airflow Sensor (MAF)
Occurrence: 8%Cost to repair: $220Symptoms:
Poor engine performance, decreased fuel efficiency
5. Rear differential failure
Occurrence: 6%Cost to repair: $1200Symptoms:
Grinding or whining noises from the rear axle
6. Faulty Electronic Throttle Control (ETC) module
Occurrence: 5%Cost to repair: $900Symptoms:
Difficulty shifting gears, erratic engine behavior
7. Transmission solenoid failure
Occurrence: 4%Cost to repair: $1100Symptoms:
Slipping or hesitation when shifting gears
8. Faulty Alternator Belt Tensioner
Occurrence: 3%Cost to repair: $180Symptoms:
Belt slippage, difficulty starting engine
9. Rear shock absorber failure
Occurrence: 2%Cost to repair: $600Symptoms:
Unsatisfactory ride quality, excessive body roll
10. Faulty Rear Differential Mounts
Occurrence: 1%Cost to repair: $400Symptoms:
Clunking or rattling noises from the rear axle
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