Wiring diagram for 02 sensors

[zperh]

I have some emission codes I need to address. P0155 and BMW enhanced 2CA7. (02 heater circuit B2 S1). I replaced the sensor and still get the same code. Now I'm trying to do what I should have done in the first place and test the circuit and sensor values. However I can't find the correct wiring diagram to do that. I've tried to use the TIS but am unable to find what I need. Can some one point me in the right direction please. 2008 Z4 3.0si
Thanks:

[Cyclops]

Originally Posted by zperh

I have some emission codes I need to address. P0155 and BMW enhanced 2CA7. (02 heater circuit B2 S1). I replaced the sensor and still get the same code. Now I'm trying to do what I should have done in the first place and test the circuit and sensor values. However I can't find the correct wiring diagram to do that. I've tried to use the TIS but am unable to find what I need. Can some one point me in the right direction please. 2008 Z4 3.0si
Thanks:

I'm not sure about the 3.0si but when I was troubleshooting my o2 sensors i used the Torque app. Allows you to see voltage ranges etc., was able to determine which one was bad.