Could be the wrong Temp unit or defective. Measure the ohms value of the old one cold and new one cold. Then hot in boiling water. See if the same. You could have a bad O2 sensor, a leaking fuel injector, a defective fuel regulator, a vacuum leak, or even a exhaust leak before the O2 sensor(s). All of these can cause the code.
96 s10 PO172 code trouble
I replaced all 4 fuel injectors about a month ago. Now I get po172 code and my mpg has dropped by about 5-7 mpg. Truck runs great though. I've since replaced EVAP purge solenoid, IAC (failed), plugs and wires, thermostat, and attempted to change ECT sensor yesterday but the new one made the temp gauge peg out hot as soon as I start the truck. So I put back the old one which has always made the temp gauge read kind of low. Any ideas?
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