The "Service Engine Soon" light came on in my '02 GT a couple of weeks ago. It was throwing a P0171 code (system adaptive fuel too lean, bank 1). I decided to see if it was a fluke, so I cleaned the MAF, and disconnected the battery for a few hours. It went away, but it came back on Friday, and now it's also throwing P0174 (system adaptive fuel too lean, bank 2). The car has 107,xxx miles. Could this be related to the O2 sensors? I don't have any mods done to the fuel system. Only mods are an off-road H and a catback.
