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Code 21

MarkF

NAXJA Forum User
I went off-roading yesterday and I had to get dragged over a tree trunk. In the process I managed to yank the cat off the down pipe so of course the check engin elight went on. A few hours later when I got to dry level ground I was able to get everything back together. I disco'd my battery and let it sit for 30 min while I filled up with air. Reconnected and the light was out. A short while later the light came back on.

I drove it 3.5 hours home with the light on, gas mileage was good, power was good and the code said 21.

Is this something that could reverse itself? Or did I kill the O2 sensor?

Thanks
 
That's definitely the O2 sensor code. You might have damaged the sensor itself or the wiring going to it. Crawl underneath your Jeep and check it out.
 
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