Hi, Steve here. My check engine light has now come on twice after Fueling. The Gas cap is secure. I fuled with the Plus grade, both times. The light goes out after a few days and starts . The Engine is running great the whole time. Had a friend check for codes, found a O2 sensor going off. I am getting my fuel at Get-Go . What grade do you run in your WJ. And other than a gas cap, has any body else had a touchy check engine light like this.
I have them same problem. I've tried everything. I was told by a veteran mechanic, that most likely the solenoid at the rear canister is sticking open, thus causing the leak code. I never changed mine, because the app on my phone automatically clears my codes. And it doesn't affect anything. Anyway that's the first thing I would look at.
What was the exact code that you pulled? You state it was an "O2 sensor going off". To me, sounds like you have a failing O2 sensor, and that the check engine light coming on when you fuel up is just coincidence. But it could just be the way you worded it also.
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