Audi , A8 , D4 , S8 (2012-2018) Common Issues

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Transmission problems and slipping
- Faulty solenoids or valve body
- Worn or damaged clutch packs
- Low transmission fluid level or poor condition
Engine oil leaks
- Cracked engine gasket or head
- Loose or corroded engine oil drain plug threads
- Damaged engine timing cover seal
Rear main seal (RMS) failure
- Worn or damaged RMS
- Corrosion on the crankshaft or differential housing
Cooling system leaks and overheating
- Cracked or faulty radiator hoses
- Clogged or blocked cooling system passageways
Head gasket issues
- Faulty head bolts or threads
- Coolant leak under the intake manifold
Engine hesitation and misfire
- Spark plug fouling or dirty spark plugs
- Failing oxygen sensor or mass airflow sensor
Electrical issues (wiring, sensors, etc.)
- Faulty can bus or wiring harness
- Dead or failing battery
Brake problems (ABS, rotors, pads)
- Worn or warped brake rotors
- Warped or damaged ABS wheel speed sensors
Suspension and steering issues
- Loose or worn-out ball joints
- Faulty air suspension control module
Air conditioning system failure
- Clogged or frozen evaporator coils
- Low refrigerant levels or faulty compressor
Fuel pump failure (fuel system)
- Failing fuel pressure regulator
- Clogged or dirty fuel injectors
DPF and EGR system issues
- Clogged diesel particulate filter (DPF)
- Faulty exhaust gas recirculation (EGR) valve
Rear axle bearing failure
- Worn or damaged rear differential bearings
Power steering fluid leak
- Cracked power steering reservoir
- Loose or corroded power steering hose connections
Air suspension system failure
- Faulty air suspension compressor
- Worn-out air suspension bellows or hoses