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I was wondering if it is possible for one or both or the oxygen sensors on my 94 MX6 V6 to be bad without throwing any codes? I'm having a problem with the car and everything seems to point to the O2 sensor(s) being bad but I have no codes.
 

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not always. I've seen sensors that were failing not throw codes.

I had the classic gas millage dropped of a cliff (from 24mpg to 18) with no codes. Replaced my o2 sensor ( I had recently replaced one of them so I guessed it was the other) and everything was back to normal.
 

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make sure you're vaf isn't dirty or starting to go, my car was throwing both o2 sensor codes from that starting to fail. it would also take 3 times to get the car to idle and not die lol.

JACK.
 
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