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Maybe the FUEL cap. if it was not on properly it will get you the CEL (Fuel system leak). once back on properly it will go out after a while.
This isn't applicable to CRD's as it is a vented fuel system.
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1. What conditions reset the CEL?
Somebody else will have to fill in the details but it depends on the CEL. Some must be manually reset; some are reset following a set number of warm-up/cool-down sequences w/o the triggering condition detected; some are reset as soon as the triggering condition is gone.
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2. If I go to the dealer now after the CEL has gone off, will the code still be present for them to know what caused the CEL?
Again, I think it depends upon the CEL, but someone else should confirm this. There are codes that can be available to the dealer regardless of the presence of a CEL.
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3. Given some of the stories on forum, what is the probability that if the code is present the dealer will be straight with me and get the problem resolved?
It probably greatly improves your chances of success but I doubt it guarantees much of anything, especially insofar as honesty & dedication goes. The nature of the particular dealer seems to be the critical variable.