Audi , A6 , C4 Common Issues

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Transmission solenoid failure (leading to faulty transmission or slipping)
Rear Main Seal (RMS) leak
Faulty Oxygen Sensor (O2 sensor)
Ignition coil and spark plug issues
Coolant leak from the water pump or other areas
Intermittent stalling due to faulty idle air control (IAC) valve
Fuel pressure regulator failure
PCV system clogging causing oil consumption and leaks
Alternator belt slipping or failure
Throttle body issues, such as carbon buildup or faulty throttle position sensor
Rear differential bearing noise or premature wear
Electrical issues with the 4-wheel drive (if equipped) system
Faulty Mass Airflow Sensor (MAF)
Spark plug wire and boot issues leading to misfires
Transmission mounts failure or leakage
Exhaust leak at the manifold, downpipe, or muffler
Timing chain stretch or jump in high mileage vehicles
Front and rear brake problems, including warped rotors or seized calipers
Steering rack and pinion issues leading to uneven tire wear
Faulty fuel injectors causing poor engine performance
Ignition system failure, including faulty ignition module or spark plug wires
PCV valve stuck closed causing low oil pressure and consumption
Fuel injector O-rings leak or clogged
Air conditioning issues, including compressor clutch failure
Rear window regulator failure in wagons (Avant) models

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