Check Engine Light

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Check Engine Light

Postby sandman7445 » Tue Aug 13, 2019 9:54 am

Check Engine Light came on the other night. Took it to Autozone for them to hook their scan tool up. Turns out the fuel cap wasn’t tightened all the way. I’ve since tightened the fuel cap but the light remains on. Will it shut off after some time or do I need to do some sort of reset?

2007 Pathfinder S 2WD

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Postby smj999smj » Tue Aug 13, 2019 10:16 pm

There are small and large leak codes for the evaporative emission system that can be triggered by a loose gas well as a number of other things. My guess is that you may have/had one of those codes stored? Did you confirm that the gas cap was actually loose or did Autozone tell you that the code was caused by a loose cap simply based on the code and not necessarily confirming that the gas cap was loose? The leak codes were once (and maybe still are) known as the "gas cap codes." Many gas caps that were perfectly fine have been replaced because parts stores told people that the code indicated a loose or faulty cap. Truth is that most of the time it's something else, like a stuck open evap vent control valve, or a split/disconnected hose in the evap system or even a leaking fuel pump module or fuel sender "O" ring.

If you problem was indeed a loose cap, it usually takes a good trip cycle to turn the light off and 50 trip cycles to clear the code from the ECM memory. Autozone should have cleared the code for you when they looked at it. If they did and the CEL came back on, then you likely have another problem and not a loose cap.

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