Back to stock- check engine light
 

Hey guys, I have traded my 2012 in on a 2017 and the deal was for me to return truck to stock with no CELs. Latest programmer was EFI live (Hardway performance). Put factory exhaust back on, plugged in all sensors, loaded factory tune and now getting code P02E9 (Diesel air flow sensor position circuit high). If anyone has had this problem and knows what they did to correct it, or can offer suggestions, it would be greatly appreciated. I am supposed to get the truck back to the dealer ASAP. Thanks in advance!