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i think you can change settings with a tech-2. That is what gm uses for a scanner, but I believe you can adjust settings, I could be wrong though. All the major tool companies like MAC, Matco, Snapon, and Cornwell, sell scanners. Mainly for information to the mechanic. You can turn relays on and off, just the basics. It will tell you stuff like A/F, and what not, but will not change factory settings. You might find a dealer that will reflash your ECM for you.
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