#purge valve
5 posts in Car Diagnostics blog about "purge valve" — OBD-II diagnostics, DTC codes, repair. ← All posts
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P0440 and P0446: EVAP purge and vent valve faults
These two codes point at the valves that seal and breathe the fuel vapour system. A stuck purge valve is one of the few EVAP faults you can actually feel while driving.
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P0441: EVAP incorrect purge flow — the valve that never opens
Not a leak code. This one says the purge valve is not moving the vapour it should, which is a different repair from every other EVAP code.
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P0443 to P0445: EVAP purge valve control circuit
Electrical codes for a valve that is easy to reach and easy to test. This is one of the more DIY-friendly items on the EVAP system.
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P0496: excessive EVAP purge flow during non-purge conditions
P0496 means vapour is being drawn into the engine when it should not be. Unlike most EVAP codes it has real drivability symptoms, and a stuck purge valve causes almost all of them.
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P0455: EVAP large leak — 10 reasons why "just the gas cap" isn't always right
Deep dive into P0455: how OBD-II detects a large leak, difference from P0442/P0456, EVAP smoke test, why gas cap first, what to do with the charcoal canister.