Audi, A6, C4, S6 4.2 Quattro (1994-) Common Issues
1. Faulty Oxygen Sensor
Occurrence: 20%Cost to repair: $1500Symptoms:
Rough idling, poor engine performance
2. Timing Chain Tensioner Failure
Occurrence: 18%Cost to repair: $1200Symptoms:
Engine overheating, excessive oil consumption
3. VANOS (Variable Nockenwellensatz) Noise
Occurrence: 15%Cost to repair: $800Symptoms:
Rattling noise from engine when accelerating
4. Faulty Mass Airflow Sensor
Occurrence: 12%Cost to repair: $900Symptoms:
Poor engine performance, reduced power output
5. Transmission Problems (4-speed Tiptronic)
Occurrence: 10%Cost to repair: $2500Symptoms:
Slipping or hesitation when shifting gears
6. Faulty Electronic Throttle Control
Occurrence: 9%Cost to repair: $1800Symptoms:
Difficulty accelerating from a standstill
7. Rear Main Seal Leak
Occurrence: 8%Cost to repair: $1000Symptoms:
Oil leak from rear of engine compartment
8. Faulty ABS Sensor
Occurrence: 7%Cost to repair: $600Symptoms:
ABS light on dashboard, grinding noise when braking
9. Faulty Rear Differential Bearing
Occurrence: 6%Cost to repair: $1200Symptoms:
Grinding or clunking noise from rear of car when cornering
10. Faulty Power Steering Pump
Occurrence: 5%Cost to repair: $800Symptoms:
Whining or groaning noise from power steering system
11. Faulty Rear Wiper Motor
Occurrence: 4%Cost to repair: $400Symptoms:
Rear wiper not functioning properly
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