Check Engine Light went off after getting gas why?

[damstr]

I don't think it was coincidence. I was driving around Sunday and the light was on. Got gas and noticed the light turned off. Any reason that this might happen?

[Vipernoob]

Maybe the gas cap was left loose at some point and is now tightened; so the evap system is no longer detecting a leak and turned the light off.

[damstr]

Maybe the gas cap was left loose at some point and is now tightened; so the evap system is no longer detecting a leak and turned the light off.
That's what I was thinking. I'll make sure to keep an eye on it.
Thanks.

[GhostStalker27]

Did you also smell gas vapor when under a half tank?

[damstr]

Did you also smell gas vapor when under a half tank?
Now that I think about it I did smell some fumes but only after I got on it. Normal driving I didn't notice anything.

[ICPREY]

Try reading the code if it comes back.

[dmerkle]

I accidentally drove 2 hours on the road and spent a whole track day without a gas cap, no engine lights at all.