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I am sure there is a sticky out there for this question, so sorry if it is a repeat...
How do you check trouble codes on C5's? I know you gotta push the buttons on the dash next to the instrument panel, but I can't remember which ones or what order. Thanks for your help!!
Following is the best site that I've found. It has all the codes specific to each model year along with instructions for running the onboard diagnostics: