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Axles swap for 80CJ-5
The Techs let me know that if you check your own codes it will erase anything that they can get. it takes a couple driving cycles to get the code back. Thermostat problems will apparently not show up with your Dashboard check.
Also, Just because your code reader says "O2" problem doesn't always mean it is the O2 Sensor. It can be that the O2 sensor is reading higher than normal O2 but it can be caused by thinks such as the Engine burning more fuel to try and force the Engine to run at otimal temps for fuel effeciancy. My mpg went down due to the computer sending more fuel to try and heat the engine to optimal temp but, with the therm stuck open it just couldn't warm up to the norm.
I am not saying that a therm is your problem, I am saying to drive it around a couple days then have a stealership read the codes for you, if possible.
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