Question about Honda Civic

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The amber engine light on my Honda Civic Si 2004 (93,000 kms) comes on when my gas tank is at the half tank mark, then two lines below half tank it goes off, and then just above the empty line it comes back on until I fill it up again full and it turns off, then the process happens all over again. This has been happening for amost 3 months now. The trouble code reads PO451. Is this a serious problem or just a nuisance?? Any suggestions would be nice!

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The gas tank has a sensor to monitor fuel evaporation. If it determines that fuel is evaporating from the tank, the check engine light will come on. It usually is caused by the gas cap losing it's seal. Get a new gas cap,make sure it is made for your car. That should eliminate the light.

Posted on Dec 29, 2010

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Posted on Jan 02, 2017

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