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You can't turn off the CEL then take it to the dealer. you need to leave the light on. They can't fix what isn't having problems at the time. Is your truck modified or stock? That has a lot to do with things. If your truck is modified a dealer may not even look at it. If your truck has a tune and you take it in for service make sure you tell them. That way they don't do a update and screw up your tune.
Like going to the doctor. My arm was hurting on Tuesday and you see him on Friday and the arm is doesn't hurt. What can he do for you at that point?
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