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Answered 2015-07-15 18:57:34
I have had the check engine light come on twice in my 95 T-100 and both times it was a faulty oxygen sensor. My vehicle which is the 6 cyl model has two of these sensors. Both are quit pricy so it is best to have a service garage check to see which one is faulty before you replace them yourself.
Also if you have removed the housing for the air filter this can cause a check engine light. Check to ensure that the housing is properly seated and the light should go out eventually.
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