$15 Bluetooth Dongle that in connection with an app, will read any code that pops up, usually with an option to reset most codes.
That said... A dealer should not be resetting a code without addressing what caused it. Doesn't matter what it is, codes don't pop up for no reason. The code is in all probability still stored where the dealer can access it (History) and or they probably have it and can provide a printout based upon your Vin! This is a non negotiable item, and the dealer would be hearing quite a lot of bitching on my part until rectified!
Crazy...
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