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WHAT ARE SOME CAUSES FOR THE CHECK ENGINE LIGHT ON?AND WHICH SENORS GO BAD FIRST

(1999 Pontiac Bonneville)
in Chicago, IL on May 15, 2014
I HAVE REPLACED UP-STREAM OXYGEN SENSOR ALREADY AND NOW WHEN I HAD IT JUSTED IT SAID DOWN-STREAM , EVAC SENSOR I HAVE NO IDEAD WHAT TO DO!!
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Popular Answer
of G. T. Service Center on May 15, 2014
Have you scanned it and verified the code is the o2.
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