Are you saying though that if you clear the code and never put it in 4WD, the code doesn't appear? But the moment you put it in 4WD, the code shows up?
Yes that’s correct but not right that moment once in 4WD. 125k. I think I found comments about folks hitting the trails, getting the CEL but once back to 2WD the light goes away. I’ve already replaced the O2 Sensor B1S1
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Did you replace the sensor with a NGK / NTK brand sensor?
Sure did, using your guide [emoji1303]
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Okay, so at least you know it's not that.
I found this:
Common problems that trigger a P0133 code:
It still doesn't make much sense that it only happens when you put it in 4WD though. That seems awfully coincidental perhaps.
- Defective oxygen sensor/air fuel ratio sensor
- Defective oxygen sensor/air fuel ratio sensor heater circuit
- Exhaust system leak
- Intake air system leak
- Low fuel pressure
- Defective engine coolant temperature sensor
- Defective sensor wiring and/or circuit problem
- PCM software needs to be updated
- Defective PCM
Maybe check the wiring going to that O2 sensor and see if there are any exposed / worn wires?
Thanks Chris. Curious about the PCM, how can I tell it’s been updated or needs updating and what would the dealership charge for that? The thing is the tj runs great, no idle or misfire issues, no loss of power or any crazy noise from the engine. I did go back and trace the O2 Sensor wires back to the PCM and unplugged the connectors, took a vacuum to them for the dust/dirt and then reconnected. I’ll have to continue watching
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I think the rear most O2 sensor loom runs over the transfer case. Is it possible when you shift that the linkage has damaged the wiring over time?