OBD-II code guide
P0496 EVAP Flow During Non-Purge
P0496 means fuel vapor is flowing when the EVAP purge system should be closed.
What it means
The purge valve may be stuck open or allowing unwanted vapor flow.
Common symptoms
- Hard starting after fueling
- Rough idle
- Stalling at idle
- Fuel smell
- Check engine light
Likely causes
- Stuck-open purge valve
- EVAP plumbing issue
- Charcoal canister saturation
- Vacuum leak through purge line
- Electrical control fault
First checks
- Ask whether the problem happens after refueling.
- Check purge valve operation.
- Look for fuel smell or rich idle.
- Scan for companion EVAP codes.