Replaced the battery on my 2004 X5 3.0 6sp and been trying to get the ECU monitors readied for smog (which is already overdue). The only system left that's not ready is the O2 heater. The O2, evap, and all that are ready, but the O2 heater seems to stay NOT READY forever. Using a foxwell scanner.

This is my 3rd car and barely gets driven, so it's taken a month of on and off driving just to get to this point. Does anyone know if the O2 heater system is required for smog, or if the E53 X5 even has an O2 heater system?