Return to stock

[blackbolt22]

On 2011+ Mustangs:

Stock File->Write Entire = Return to Stock

Stock File->Write Cal = Return to Stock? If I write the stock Cal and have never done a Write Entire with any other OS, is it officially returned to stock or do I have to do a Write Entire. Please only answer if you're 100% sure.

How does P0605 play a role into this? Set it back to stock as well and if the Cal is stock it won't flag?

[95Gturbo]

P0605 is set with write calibration, as it will know that the PROM has been modified. If the calibration is returned to 100% stock, a write calibration will not set a p0605...speaking from experience on both s197 and s550 cars. At least I didnt recieve that code and i had it enabled on both cars

[blackbolt22]

Sweet so it must just do a checksum on the calibration and throw a code if it isnt right. Thanks!!