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P0496: Evaporative Emission System High Purge Flow
Severity: Medium Drive gently and get it diagnosed soon.
What does P0496 mean?
Vapor is being purged when it should not be, usually because the purge valve is stuck open.
Generic OBD-II definition: Evaporative Emission System High Purge Flow. Confirm applicability in your vehicle service information.
Common causes
- Purge valve stuck open or leaking
- Purge valve wiring shorted so the valve stays energized
- Vent valve or hose problem affecting EVAP pressure readings
- Faulty fuel tank pressure sensor
Symptoms
- Rough idle or hard start right after refueling
- Possible lean or rich fuel trim codes
Can I keep driving with P0496?
Severity: Medium Drive gently and get it diagnosed soon.
If the check engine light is flashing or the car runs badly, stop driving and have it checked.
Typical fixes
- Apply vacuum to the purge valve with it unpowered; it should hold
- Check the purge valve wiring
- Check the fuel tank pressure sensor reading
- Replace the purge valve if it leaks