code 21 on 22re
#2
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Code 21 is for your oxygen sensor, it may not effect your running but I bet it's impacting mpg. If your wiring is good the oxygen sensor is probably bad.
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You have a full engine/ecu harness? I would get in there with a voltmeter and check connections before replacing the full harness. You may have a bad sensor, no point in replacing wiring if that's the case.What engine do you have? Oxygen sensor testing is pretty straight forward.
#5
Harness has to be replaced the po spliced wires for some reason to make the master power switch a flip switch in truck you have to flip that then you can crank it with the key. But how do you test it that way I know it its bad and isn't there 2. O2 sensors
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This is the procedure for testing.This is from a 93 fsm your specs should be the same. You didn't specify engine so I'll post both. 22re http://personal.utulsa.edu/~nathan-b...42oxygense.pdf 3vze http://personal.utulsa.edu/~nathan-b...01heatedox.pdf
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You want to set your meter to check for resistance (The symbol looks similar to a horseshoe). You first want to check how many times the meter deflects in a ten second period. Needle type meters are best for this but it can be done with a digital meter as well. If if deflects more than 6 times in the ten second period it's normal and the sensor is good. If not you continue to page 2 and disconnect the pcv hose and check the voltage across the specified terminals. I wouldn't worry too much about that portion. You want to focus on the first page, and how many times it fluctuates in the ten second period.
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