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Message: [QUOTE="gnxtc2, post: 1460641, member: 1414"] I don't think that has anything to do with it. Tuning guys, correct me if I'm wrong but you change the setting on how quick the CEL is tripped. If Jonathan has X pressure programmed and the truck produces X pressure, he can set the parameters on how quick or disregard the CEL if pressures aren't met. With your case, the truck might be making over pressure than it's programmed and tripping the CEL. The P1211 is such a generic code. One of my best moves was getting rid of the Dyno tunes and every performance part related to DynoProven off my truck. Ever since he opened DynoProven, his customer service sucks. I sent in a chip that had live tunes on it for a minor idle tweak. I waited 2 months and get back a chip with different tunes. Yep....my tunes were gone. Billy T. [email]gnxtc2@aol.com[/email] [/QUOTE]

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