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13 Challenger RT, 11 CTS Coupe Premium, 94 Eldorado (RIP)
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I haven't any problem doing it. As a matter of fact, I did just that tonight. I thought I heard an odd noise and curiousity got the best of me, so I went in while driving. Don't get too distracted though.
 

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Cadillac Technician
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11,038 Posts
You can do it at any time. It won't hurt.
Although the MIL (Malfunction Indicator Lamp, fancy for CEL) will be on the entire time you are in diagnostic mode... which sometimes fools me. LOL
 
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