oxygen sensor on 1998 Toyota 4Runner

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

by in Weaverville, NC on March 27, 2011
1 answer 4 comments
ANSWER by on March 27, 2011
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
COMMENT by on March 28, 2011
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
COMMENT by on March 28, 2011
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
COMMENT by on March 29, 2011
Thank you so much, I'll do that! Katelin
COMMENT by on March 29, 2011
good luck roy
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