What does code P0442 mean on a BMW and is it safe to drive?
P0442: Evaporative Emission System Leak Detected (Small Leak). Here's what it means on your BMW, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
The EVAP system has detected a small leak. Often caused by a loose or faulty gas cap or a small hose leak.
Common causes for your BMW
- Loose, damaged, or wrong gas cap
- Cracked or disconnected EVAP hose
- Faulty purge or vent valve
- Leaking charcoal canister
Symptoms
- Check Engine Light
- Often no driveability issues
Typical fixes
- Tighten or replace gas cap
- Smoke test EVAP system
- Replace damaged hoses or valves
Repair cost range
For a BMW, repairs for P0442 often fall between $15 and $300, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on BMW
BMW P0442 often points to a defective gas cap (use BMW OEM or quality aftermarket) or a cracked EVAP canister hose. The activated charcoal canister can crack on high-mileage models and requires smoke testing to locate.
Most commonly affected models
3 Series 2006–20125 Series 2008–2013X3 2007–2013