Anyone else with a 2nd Gen Frontier/Xterra have the SES light come on after filling up with Shell 87, yet have it turn off after filling up with Shell 89?
Stock engine w/Volant Cool Air Intake.
Have had the fuel sending unit replaced on warranty a few years back
Im thinking IMS, and a chip, 33s, and a lift should solve the problem:P
If it came off right after you filled up, it could be that you didn't put your cap on right, that'll throw the SES light and it will clear a day or two after you fix it (ie: the next time you filled up).
My SES light (06 Xterra) also comes on due to a design flaw on the evaporative canister valve - it gets clogged with dust when you drive on gravel roads. It's not a critical problem, there are some DIY fixes if you google the problem, but I just clear the code and it's all good until the next time I drive on gravel.