The EVAP system prevents fuel vapors from escaping into the atmosphere. P0442 specifically means the system's leak detection pump or system has detected a small leak somewhere in the system. This could be due to a variety of issues, including:
* Loose or damaged gas cap: This is the most common cause. Try tightening the gas cap first.
* Cracked or damaged fuel tank: Less common, but possible. Requires a more extensive inspection.
* Leaks in the EVAP hoses or lines: These hoses can become brittle and crack over time.
* Faulty EVAP purge valve: This valve controls the flow of fuel vapors.
* Problems with the EVAP canister: This canister stores the fuel vapors.
* Faulty EVAP vent valve: Allows air to enter the system as needed.
* Sensor issues: A malfunctioning sensor can trigger the code even if there's no actual leak.
You'll need to have a mechanic diagnose the precise location of the leak. Simply tightening the gas cap might resolve it, but a more thorough inspection is recommended to ensure the EVAP system is functioning correctly and to prevent future problems.
