06 and the ECM...Monitors?

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Dans06Tahoe

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Jan 13, 2016
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I put a deposit on a 06 Tahoe. The dealer went to get it inspected and even though no check engine light. It won't pass because he says only four of the six monitors are tripped. The local Chevy dealer checked it out yesterday and told him to just drive it. He has put 500 miles on it and still no good. Can anybody give any info on this?
 
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