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1999 Chevrolet Tahoe Base 2dr

1999 Chevrolet Tahoe
Trim Info:
Rear Wheel Drive, 2 Door
14 mpg city / 18 mpg hwy
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April 30, 2013, 3:26 pm

Ricky G

Question: what causes a pcm to send out different troubleshooting codes every other day?

I have a 96 chevy tahoe lt 5.7l and its been a few months that the service engine has been on. I got it checked out and i was told it was one or two of its o2 sensors. i have 4 so i replaced all of them just to be safe. The light never turned off. I got it looked at again and then it said it was my CAT. I replaced the CAT with a brand new one and the light still stood on. I took it to get checked again and now it says its still my o2 sensors (bank1 sensor1 lean circuit). I got the light erased to see if it would help and it just turned on again. I went to advanced auto, auto zone, and 2 different neighborhood mechanics to see what was going on because i was noticing different codes being sent out at each place. I have replaced : all O2 sensors, new fuel filter, CAT, mufflers, cleaned out the mas air flow sensor,new plugs, wires, oil, oil filter, air filter and its still the same.

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