Audi, A6, C4 Common Issues
1. Faulty Fuel Pump
Occurrence: 12%Cost to repair: $550Symptoms:
Difficulty starting the engine, stalling, or irregular fuel consumption.
2. Bad Fuel Filter
Occurrence: 15%Cost to repair: $250Symptoms:
Low fuel pressure, rough engine idle, or decreased engine performance.
3. Faulty Oxygen Sensor
Occurrence: 18%Cost to repair: $420Symptoms:
Rough engine idle, reduced engine performance, or increased emissions.
4. Bad Alternator
Occurrence: 11%Cost to repair: $450Symptoms:
Slow charging, dim or flickering headlights, or electrical system malfunctions.
5. Faulty Airflow Meter
Occurrence: 14%Cost to repair: $380Symptoms:
Poor engine performance, rough idle, or decreased fuel efficiency.
6. Faulty Mass Airflow Sensor (MAF)
Occurrence: 13%Cost to repair: $320Symptoms:
Rough engine idle, poor engine performance, or decreased fuel efficiency.
7. Bad Catalytic Converter
Occurrence: 12%Cost to repair: $650Symptoms:
Reduced engine performance, excessive emissions, or a 'pinging' sound from the exhaust system.
8. Faulty Ignition Coils
Occurrence: 16%Cost to repair: $280Symptoms:
Difficulty starting the engine, rough idle, or misfires.
9. Bad Spark Plugs
Occurrence: 10%Cost to repair: $200Symptoms:
Difficulty starting the engine, rough idle, or decreased engine performance.
10. Transmission Problems
Occurrence: 9%Cost to repair: $1200Symptoms:
Slipping gears, difficulty shifting, or unusual noises from the transmission.
11. Faulty ABS System
Occurrence: 8%Cost to repair: $900Symptoms:
Spongy brake pedal, uneven braking, or illuminated warning lights on the dashboard.
12. Bad Wheel Bearing
Occurrence: 7%Cost to repair: $800Symptoms:
Unusual noises from the wheels or tires, vibrations while driving, or uneven tire wear.
13. Faulty ECU (Engine Control Unit)
Occurrence: 6%Cost to repair: $850Symptoms:
Difficulty starting the engine, rough idle, or decreased engine performance.
14. Bad Throttle Position Sensor
Occurrence: 5%Cost to repair: $320Symptoms:
Rough engine idle, poor engine performance, or decreased fuel efficiency.