If the Check Engine Light is on, there is something not working properly, and not understanding what it is supposed to do is not good. I'd take it down to Champs in Surprise to at least find out what is needed and what problems it will cause by not working. 623-376-6791
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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