MasterTuning Fault code dictionary (DTC)

P0442 — Evaporative Emission System Leak Detected (Small)

Severity: Informational Can you drive? Yes, no known limitation Make: All makes (OBD-II standard)
MeaningThe engine computer found a small leak in the fuel vapor recovery system. This system captures gasoline vapors from the tank and sends them to the engine to be burned, preventing them from escaping into the air.
FamilyPowertrain (P)

Typical symptoms

Check Engine light is on
Possible faint smell of gasoline near the rear of the car
Nothing unusual in how the engine runs

Common causes

Loose, damaged, or worn-out fuel filler cap
Small crack in one of the rubber hoses connected to the vapor canister
Faulty vapor vent valve or purge valve that is not sealing correctly

What to do

Check your gas cap first to make sure it is tight and the rubber seal is not cracked. It is not an emergency that will leave you stranded, but you should get it checked during your next routine service.

Frequently asked questions

What does code P0442 mean?

Evaporative Emission System Leak Detected (Small). The engine computer found a small leak in the fuel vapor recovery system. This system captures gasoline vapors from the tank and sends them to the engine to be burned, preventing them from escaping into the air.

Can I keep driving with code P0442 active?

Yes, no known limitation

Common causes — P0442

Loose, damaged, or worn-out fuel filler cap Small crack in one of the rubber hoses connected to the vapor canister Faulty vapor vent valve or purge valve that is not sealing correctly

How do you fix code P0442?

Check your gas cap first to make sure it is tight and the rubber seal is not cracked. It is not an emergency that will leave you stranded, but you should get it checked during your next routine service.

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