Question about 1995 Toyota Tacoma
Both o2 sensors were replaced just over a year ago. The cat was replaced less than a year ago because there was a cheater pipe welded in its place. In Feb the check engine light would come on than go out. Eventually it lit up and stays lit. I brought it to a mechanic and he put it on the scanner and told me that I had a P0420. I have a Haynes repair manual and it told me how to check the O2 sensors with a volt/ohm meter. the ohm readings were out of the accepted range of 5-7 ohms on the heated side of the sensors 15 ohms. I also have a chilton's repair manual and it mentions nothing about testing the resistance values but does mention about the voltage values. The voltage varies from .1 to .9 volts constantly changing with both O2s.
Sensors maybe aftermarket or bad there very sensitive may haft to replace!!!!
Posted on Jun 22, 2009
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Posted on Jan 02, 2017
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