where are the o2 sensors located on 99 explorer?


Asked by Aug 10, 2014 at 12:47 PM about the 1999 Ford Explorer 4 Dr Limited 4WD SUV

Question type: Maintenance & Repair

after starting motor idles in park fine. when put in drive the engine stalls

3 Answers


There should be two, but could have four. They are always located in the exhaust pipes. If there are two, one is before the cat converter and the other past it. Referred to as upstream and downstream O2S. They look like a spark plug screwed into the pipe. It has an electrical wire attached to the top. You may want to check on the internet for the procedure to test them. They are not cheap and usually not refundable

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Dee Love

Howmuch do they cost

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If you are either doing the job yourself or having someone do it for you, but you are buying the parts go to rockauto.com They are about half the cost of local chain automotive stores and probably almost 3 times cheaper than a garage will charge you for them.

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