When I took my CHevy Silverado in for my emissions test, I was shocked when I didn't pass. Didn't realize anything was wrong, though it has been sounding a little noisy, according to my wife.
When I brought it in, they ran a diagnostic and found a sensor that needed to be replaced and when I picked it up, went right back to the emissions testing and passed without a problem. Glad they could get to my truck so quickly.
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