Evaporative Emission Control System Leak Detected (small leak)
This indicates a fuel vapor leak in the EVAP control system. It means a
very small leak has been detected. In fact, the leak can be from a hole
as small as 0.04" in diameter. The (EVAP) emission control system
prevents the escape of fuel vapors from a vehicle's fuel system. Fuel
vapors are routed by hoses to a charcoal canister for storage. Later,
when the engine is running a purge control valve opens allowing intake
vacuum to siphon the fuel vapors into the engine.
Causes: A code P0442 most likely means one or more of the following has happened:
* A loose or improperly affixed gas cap
* A non-conforming gas cap (i.e. not factory/original brand)
* A small leak/hole in a fuel vapor hose/tube
* Other small leak in EVAP system
* Faulty vent o-ring seal
Possible Solutions: With a P0442, the most common repair is to:
* Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
* Otherwise, replace the gas cap, or
* Inspect the EVAP system for cuts/holes in tubes/hoses
Keep us updated.
SOURCE: 98 BMW ti _ Engine Light P0442 (Small Evap Leak)
hi. about half of the time the only real problem is that the sensor itself if faulty. have it put on a scanner, they do that for free at many auto parts stores like autozone
2,674 views
Usually answered in minutes!
×