Check Engine Soon light. Possible cause?

[///Bruce]

Day before yesterday, I filled her up and didn't turn off the engine until after I opened the gas cap. Yesterday, I noticed a Check Engine Soon light. Are our cars overly sensitive to doing something like not turning off the engine while we pump gas?

The shop showed a DTME fault (or something along that line...). I didn't want to wait an hour for them to run a full diagnostic search for the cause. I figured I'd wait to see if it happens again after the next fill up. And, next time, I'll turn off the engine BEFORE I open the gas cap.

[Zulu95]

Yes. Gas cap loose with engine running will trip a SES.

[///Bruce]

Z95, it's not loose. I can vouch for that. I believe I tripped the SES when I opened the gas tank with the engine running.

[4.6is Ryder]

Originally Posted by ///Bruce

Z95, it's not loose. I can vouch for that. I believe I tripped the SES when I opened the gas tank with the engine running.

That's exactly what happened.....Phil

[footsurg]

If the cap is loosened for any reason while the engine is running the SES light will illuminate. Whether it be that you forgot to tighten it after a fillup or loosened it while the engine was running you will get the same result. The light will go away on its own after a few days provided you don't trip the sensor again.

[Zulu95]

That's what I meant. It trips even if it is a little loose. If you remove it that's a LOT loose!

[///Bruce]

Okay, one rolling funny face was funny. But two? Ah, that's cold.