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Q: oxygen sensor on 1998 Toyota 4Runner

where is the oxygen sensor located and how hard is it to replace?

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there are upstream and downstream o2 sensors. you need to know which one specifically is bad.
did you get a real diag or a free code pull. if you got the code pull, have the diag before you replace it. a code never identifies a bad part just a failed system.
what code did you have??

Roy
I put a k&n air filter on it and now I am getting 50miles per 1/4 tank of gas. That is horrible, I know the oxygen sensor will cause extreme gas intake and thought it might be the reason.. I haven't had the sensor tested yet. If you have any other reasons for this I would be very grateful.
Katelin
get rid of the k and n filter. it contains oil in the filter and that contaminates the sensors. i would start there before doing anything else.

Roy
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