Emission code

What does emission code PO440 stand for

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Submitted 232 days ago...

Rick_

Expert (677)

These codes represent failure or defect in the vehicles EVAPORATIVE EMISSIONS SYSTEM it keeps harmful fuel vapors from escaping into the atmosphere. This failure can range from a loose or defective Gas Cap or its Seal, to a leak in one of the plastic tubes that run from the fuel tank to the engine compartment and a charcoal canister where fuel vapors are stored.

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