Audi, A6, C5, 2.8 Quattro (1997-) Common Issues
1. Rear Main Seal Leak
Occurrence: 20%Cost to repair: $1200Symptoms:
Oil leak from rear of engine, blue smoke coming from exhaust
2. Sump Pan Leak
Occurrence: 18%Cost to repair: $900Symptoms:
Oil leak from front of car, may cause overheating if severe
3. Fuel Pressure Regulator Failure
Occurrence: 15%Cost to repair: $700Symptoms:
Poor engine performance, hesitation on acceleration
4. Faulty Oxygen Sensor
Occurrence: 14%Cost to repair: $600Symptoms:
Fault codes stored in ECU, poor fuel economy
5. Water Pump Failure
Occurrence: 12%Cost to repair: $1000Symptoms:
Overheating engine, may cause engine failure if not addressed
6. CV Joint Failure
Occurrence: 11%Cost to repair: $800Symptoms:
Clicking or clunking noise from rear wheels when driving
7. Front Wheel Bearing Failure
Occurrence: 10%Cost to repair: $900Symptoms:
Grinding or screeching noise from front wheel
8. Rear Brake Wear
Occurrence: 9%Cost to repair: $400Symptoms:
Spongy brake pedal, low brake performance
9. Fuel Pressure Leak
Occurrence: 8%Cost to repair: $700Symptoms:
Poor engine performance, hesitation on acceleration
10. Faulty Mass Airflow Sensor
Occurrence: 7%Cost to repair: $500Symptoms:
Fault codes stored in ECU, poor fuel economy
11. Rear Differential Failure
Occurrence: 6%Cost to repair: $1500Symptoms:
Clunking or grinding noise from rear of car when driving
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