o2 heater circuit

Currently wrestling with a silly little TJ. (97) Had O2 sensor codes and rough idle with loss of power before engine reached “closed loop” temps. Replaced O2 sensors (with the ones recommended by the updated O2 sensor thread) and it ran fine. Drove about 1800 miles then bang O2 codes again...

My problem started with 5 o2 sensor heater circuit codes. Then the ac stopped working. Then it started shifting hard out of 2nd. Now it’s running like injectors aren’t working. Obd2 port just stopped working. I have checked all the grounds I can find even tried running a thick wire from the...

I just replaced the o2 sensor bank 1 sensor 1 but the jeep is my play around vehicle. Got in it today and had cel. Had it ran and this was it. I had checked the volts on map sensor. Everything seemed fine. What else could it be. Im not to familiar with map sensors.

Ok guys, I’ve got one for you. I’ve had my 97 TJ for a couple of years now. Recently the MIL came on and showed a P0138 and a P0141 for downstream o2 sensor heater circuit. I said ok, I bought an o2 sensor online (not Bosch) and installed it. Code went away for about a day and then came back...