You need to disable lambda plausibility diagnosis, heater and heater endstage diagnosis. There are certain codewords to do both.
There is no ESKONF on MED9, it is done through specific codewords/voltage limits.

Look through the damos "Endstufe" for end stage, "Heiz" for heater. CDLSH/CDLASH should take care of the lambda diagnosis.

If you are lazy, just disconnect the lambda, note the fault codes and kill the fault classes.
It is not the "right" way but in the end it makes absolutely no difference, because once a lambda fault is debounced everything regarding the rear o2 is switched off in the ECU anyway.