Problem indicates a fault with the Rear O2 sensor or its circuit. It is possible the gas change had caused the problem but O2 sensors tends to fail over time so it could also be coincidence that it occurred.

Answered by KHLow2008 (expert)
40,332 answers provided

Thanks for ur reply, I cleared it last night,and I have been driving almost for 40 miles, and no light appeared again, do you think it would come backup? I called the dealer they told me it isnt a big deal and its probably the cap or I filled the car while its running, do you thin that could cause it? or they are PS'ing me?

Response from AngeloX5
1 question asked

Yes, a loose fuel cap can trigger trouble codes but it should no tbe the one listed.

Trouble codes with O2 sensors can be intermittent and it might come back but as the dealer mentioned, this fault code is nothing serious so you need not be too worried about it.

Answered by KHLow2008 (expert)
40,332 answers provided