P0442
P0442 EVAP Small Leak
P0442 means the EVAP system could not hold pressure or vacuum during a leak test, but the leak is small.
How urgent is P0442?
This usually will not affect drivability, but it can fail inspection and may smell like fuel.
Common symptoms
- Check engine light
- Fuel smell near vehicle
- Usually drives normally
- Hard start after fueling in some cases
Likely causes
- Loose or failing gas cap
- Cracked EVAP hose
- Purge valve leak
- Vent valve issue
- Small canister leak
What to check before replacing parts
1
Tighten or inspect gas cap
2
Smoke-test EVAP system
3
Check purge valve sealing
4
Inspect hoses near tank and engine bay
5
Verify vent valve operation
Use the code with symptoms
A code points at the system, not always the failed part. Add your vehicle, mileage, symptoms, and whether the check engine light is steady or flashing so the AI diagnostic can narrow the next step.