Code P0442B appears in these brands
Go to messages and symptoms for your brand — there we analyze this code together with other typical alerts.
P0442B
NiskiEVAP System — Small Leak (BMW)
OBD-II (EN): Evaporative Emission System Small Leak Detected
Code P0442B — EVAP System — Small Leak (BMW). Symptoms: check engine light. Possible cause: loose fuel cap (BMW bayonet-type cap). Professional diagnosis recommended.
Symptoms
Check engine light, gasoline smell, often after refueling
Possible causes
Loose fuel cap (BMW bayonet-type cap), faulty EVAP purge valve, leaking carbon canister, damaged fuel tank seal
Affected systems
Silnik spalinowyUkład odparowania paliwa (EVAP)
Universal version
This code has a universal OBD-II form:
P0442System EVAP — wykryto mały wyciekDoes code P0442B require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.