I got a chip and I NEED to use 91+ octane gas. but I went to a "w/ service" gas station and I assume the guy put regular in... Also I use Bosch Plat+2 spark plugs(I know they aren't recommended, I'll change them soon).
If the code is related to the O2 sensor, can one of these, or both, be the cause of the problem?
thanks quack for helping
edit: what does the o2 sensor?