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I have a 1996 Jeep Grand Cherokee 4WD 4.0. My son got it stuck in the mud (not on purpose), got it out, but now is having problems with it shifting from 1st to 2nd and it seems to take a few moments to kick into gear and go from a complete stop. Took it to a transmission shop, they put a computer to it and said that it was throwing a lot of codes and wants my son to bring it back. Said it was showing a bad 02 sensor and they think it might be that, that can be causing it not to shift.......anyone have any comments or know if it might be the PCM? The 02 sensor has been bad for a couple of years and we just never replaced it because of cost. Any help would be great so that we aren't paying a transmission shop for parts that don't need replaced.
I also forgot to state, that if you turn it off and let it set for a couple of minutes and restart it that usually it will shift with no problems.