I have the mk808 and can't figure out how to reset fuel comp. And trims on a 201 Tahoe with flex fuel. It tells me function not found when I look for it
Not available on the 808. I believe you need the MK906 or higher to initiate any sort of value reset. I ran into this on a 2011 HHR with a high Fuel/Alcohol content and my MK808BT would not do it either.