So I had a shop install an o/r H-pipe on my 96 gt Automatic recently. I didn't have any MIL eliminators installed, because I have a Bama handheld tuner from American Muscle, and figured it would be able to turn off the rear 02 sensor codes, and save me some money. Well the tuner looks to have turned off the rear sensors just fine, but soon after the install and applying the tune I received p0135 and p0155 which appears to be front 02 sensor codes (bank 1 sensor 1 and bank 2 sensor 1) for a heater circuit malfunction. Has anyone run into this issue or anything similar before or have any advice or thoughts? The car seems to be running same as always so far, no misfires or anything... I know they had to do a little bending in order to get around some stuff because the car's an automatic... not sure that would have anything to do with anything though. I also think I might be hearing a little bit of rattling when I put the car in reverse to leave my driveway, but it sound fine after that.