P0442 (Audi): Defective or damaged fuel cap, Distorted or damaged Fuel Tank Fill… — what it means, the affected system and what to check before replacing parts.
Defective or damaged fuel cap, Distorted or damaged Fuel Tank Filler Neck, Small tear or puncture in the Evaporative system hose(s) and or Carbon Canister, Defective Fuel Tank Sending Unit gasket or seal, Small split in a seam of the Carbon Canister, Defective Evaporative Vent Valve and or Evaporative Purge Valve, Defective or damaged Fuel Tank, Defective Fuel Tank Pressure Sensor, Defective Leak Detection Pump, Slightly loose and or worn clamps or hardened O-rings anywhere in the EVAP system. Source catalogue definition; confirm applicability using vehicle service information.
Affected system: Powertrain