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I have read many times that should you disconnect the battery totally, ensuring there is no power left in the electrical circuits, it should erase the memory in the PCM / ECU sending it back to factory default settings.
So I would gather that any changes you made from the default settings would be lost. Though...I stand to be corrected with that as I have never had the need to disconnect the battery...in this Jeep or my previous WK2, so don't know whether the changes I have made via JScan would be lost.
I doubt personally that superficial changes made via the OBD port would impact the engine sensor communications with the ECU.
I would never suggest allowing a Dealer to touch any Jeep, but maybe it is worth in this case having a Dealer just do a diagnostic on it to discount the possibility of ECU changes?
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CJ5, CJ7, XJ Sport, WJ HO V8 Overland, WH Hemi V8 Overland, 14 WK2 CRD Laredo-RIP, 15 WK2 CRD Laredo
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