Courtesy of member RW1 and the old wiki - this requires a licensed/activated copy of VCDS/VAG.com to access the basic settings function: VR6 ECU Reset Procedure   ENGINE ECU RESET & “BASIC SETTING” ENGINE ECU RESET Disconnecting the Engine ECU from it's power supply will loose the "learnt" values in the memory such as the pre-set O2 lambda values for idle, mid throttle and full throttle positions. (NB. If battery is disconnected to reset the ECU or Throttl