P0456

Asked by Nov 30, 2016 at 09:43 PM about the 2003 Ford Expedition XLT

Question type: Maintenance & Repair

Just scanned my truck. Where should I start when
looking to repair for code p0456? Thank you for
any help

2 Answers

9,265

Check the gas tank cap first, loose cap can trigger this code

1 people found this helpful.
20

Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause: •A small leak in any of the EVAP hoses or fuel tank hoses •A small leak in the purge valve or vent valve •The EVAP Canister may be leaking

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