TCU has redundant data stored in firmware for 10+ different car variants that include torque curves, pressure maps, tcc control, gearbox planet ratio for large and small 722.6, and many more function calibrations, and when you use a scan tool to write coding to the chassis of a car it reverts any changed calibration area back to STOCK virgin calibrations for that coding of chassis that was entered. DO NOT RECODE TCU OR YOU WILL GO BACK TO STOCK. If the coding string needs changed use mbgeartool/vediamo or pull the file and manually code with winols or other hex editors.