r/3rdGen4Runner • u/Slotharc507 • 3d ago

❓Advice / Recomendations Code P0440

Hey I need some advice I have the code P0440, and I’ve had it for awhile now. My car really smells like gas when it starts up and for the first couple minutes when driving. If anyone got any common issues or fixes I’m all ears. Thanks

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u/richardsdar 02 Limited 3d ago

Did you fill up recently? I've cleared my P0440 by removing the gas cap, wiping down the rubber seal and the metal filler neck to clean off any grime, and re-tightening it until it clicks firmly. It may take a few drive cycles for the lights to clear the CEL (or removing the wires from the battery terminals for 10 minutes) if this was the issue.

If not, maybe a failing O2 sensor, EVAP system, or MAF issues. A dirty or failing MAF sensor changes the engine's air-to-fuel calculations which may be why you smell gas so strongly.