P0442
P0442 is a generic OBD-II diagnostic trouble code that indicates an evaporative emission system leak detected (small leak). It is defined by SAE and used by most modern gasoline-powered vehicles. The EVAP system captures fuel vapors from the fuel tank and routes them into the engine for combustion, rather than letting vapors escape to the atmosphere.
When the EVAP small leak is detected, the ECU stores P0442 and the check engine light turns
Common causes include a loose or degraded gas cap and its seal, cracked or disconnected vacuum hoses,
Symptoms are usually a check engine light; drivability impact is often minimal. Some drivers notice a fuel
Repair involves fixing the leak source, clearing the code, and allowing the EVAP monitor to complete. If