Devils back in the TJ. I replaced the upper O2 sensor end of Sept. That solved my hitchin and bucking prob that occurred about 45 seconds after start. The symptoms for that bad sensor escalated to the point where the volt regulator needle would drop to zero, a beep would sound, and the check engine light would come on. I replaced the O2 sensor with a bosch from autozone, and all was well.
Well, the devil hitched a ride with me again, starting yesterday. She's doing the same thing. Start her up, she'll idle all day, but when I apply a load, then immediately "Beep, needle goes to zero, CEL comes on" and she hitches a bit. Fuel mileage is in the crapper, and the battery is dead.
I'm wondering about the durability of these Bosch upper O2 sensors. Could it be possible that the sensor is bad after 2 months? Or do I need to replace the rear after Cat O2 sensor? The rest of the jeep is fine. Up to tweo days ago all was well.
I'd replace the rear sensor, but on USAF pay (even nowadaze) if I don't need to I'd rather not.
Thanks for your expertise.