You're going to have to turn the rear 02 sensors OFF in the tune. Your handheld tuner can not do this for you.
You'd have to ask your mechanic about that. He'd need some tuning software that can upload a new tune via your OBDII port. Correct on the second sentence.i have no tuner yet, is this something my mechanic can do? the first set is in the header right, so they wont be messed with?
great thanx,,, so if i cant turn em off right now will it hurt anything or the performance,,,by having the engine light on??? thanx sully