Yes, it could be the O2 is going bad or your just overrunning the 2G FPR. Do you know your fuel trim #s? If you have changed anything recently, I would reset the ECU and see what the fuel trims do over the next few days. The 2G ECU gets mad and starts throwing fuel trim errors when your as little somthing like 12% out of trim, the 1G ECU doesn't give a shit.
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