What does code P0442 mean?
P0442 means there is a small leak in the EVAP system. The EVAP system stops fuel vapour from the tank escaping: it stores it and later burns it in the engine. When the computer tested it, the system did not hold pressure properly.
Why does code P0442 appear?
- The fuel cap is loose or its seal is worn.
- A thin EVAP hose has cracked.
- A faulty purge or vent valve.
- A leak at the charcoal canister or the tank filler neck.
What can you safely check for P0442?
- Check the fuel cap: it should sit properly and be turned until it clicks. If its rubber seal is cracked, fit a new cap made for your car.
- After fixing the cap, the light doesn't go off straight away. The computer re-tests over a few days of driving, then the light goes off by itself.
Is it safe to drive with P0442?
You can keep driving; this is not an immediate danger. But if there is a strong smell of fuel, switch off, keep any flame or cigarette away, and get it checked soon.
Safety: never remove the radiator cap on a hot engine; boiling coolant can burn you. Keep your hands away from the fan and belts while the engine runs. If you smell fuel, switch off, keep any flame or cigarette away and call a mechanic.
When should you call a mechanic?
If the code returns some days after fitting a good cap, have a car mechanic (mistri) check it. A smoke test finds small leaks.