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It is one of the O2 sensors. Most parts houses around my part of the country will check the codes and tell you which one is the problem child for free. Unless your tranny is shifting funny, in other words, if it is working correctly, then it is probably not a fuse issue. Sensor itself may be bad, but all the sensors of my 97 jimmy were throwing codes when I first got it. Disconnected all the plugs to them one at a time and wire brushed what I could get to. Used dielectric grease when I plugged them back up. Reset the computer and the codes have not come back. I have noticed that most of the codes I get are just corrosion of the plugs. Make it a routine. If you unplug, clean and grease the fitting before replugging.

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12y ago
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Q: PO151 on 97 GMC Jimmy
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