Quote:
Originally Posted by Bernardchan96
Sounds like a good service history record, but some of the things on that truck are a couple red flags. Why would he unplug the O2 sensor, bad cat or bad o2 sensor? the former is cheap the latter could be costly if you are in an emissions state. 4LO selector not working, could be expensive actuator fix. i would maybe take a look at a different vehicle
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The thing that was unplugged was for the AC compressor. Don't know why it was unplugged and I forgot to test the AC. 4LO started working after rocking it a bit.