

Audi, A6, C4, 2.6 Quattro (1994-) Common Issues
1. Faulty Rear Axle Bearing
Occurrence: 15%Cost to repair: $1200Symptoms:
Rumbling or growling noise from rear axle, vibrations when driving
2. Catalytic Converter Failure
Occurrence: 20%Cost to repair: $1000Symptoms:
Rough idling, decreased power, strong smell of gasoline near catalytic converter
3. Faulty Oxygen Sensor
Occurrence: 18%Cost to repair: $450Symptoms:
Poor engine performance, rough idling, decrease in fuel efficiency
4. Transmission Problems (Tiptronic)
Occurrence: 12%Cost to repair: $850Symptoms:
Unusual noises or hesitation when shifting gears, inability to shift into certain gear modes
5. Faulty Alternator
Occurrence: 14%Cost to repair: $650Symptoms:
Dimming headlights, electrical system failures (radio, wipers, etc.), slow engine crank
6. Rust Issues with Rear Wheels
Occurrence: 16%Cost to repair: $300Symptoms:
Corrosion visible on rear wheel wells and surrounding areas
7. Faulty ECU (Engine Control Unit)
Occurrence: 9%Cost to repair: $950Symptoms:
Poor engine performance, random error messages on dashboard, inability to start engine
8. Water Pump Failure
Occurrence: 11%Cost to repair: $900Symptoms:
Coolant leaks near water pump, overheating engine, hissing sounds
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