E90 Oxygen Sensors

[IrvesBMW]

I am attempting to eliminate these two mistakes.

2CAB - lambda sensor 2 before to catalyst, temperature
2CA7 - Lambda sensor pre-catalyst 2 heating function


Enquiries:

Is the lambda probe 2 located before or after the catalytic converter?

I acknowledge it states otherwise, but other Google results indicate the contrary, so I wanted to verify.

Do the two errors pertain to the same sensor?

3. Upon examining realoem, there are two sets of lambda probes/sensors; could you clarify their distinctions and functions?

[ByteStorm]

Pre-cat bank two.

[IrvesBMW]

Do you have any information on the other items?

[ByteStorm]

Both malfunctions pertain to a single sensor. The heater circuit will be nonfunctional.

[IrvesBMW]

Thank you.

Could you identify the section in the accompanying screenshot that corresponds to pre cat bank 2?

[ForumGuru]

I would indicate number 20, since bank 2 will correspond to the rear catalytic converter for cylinders 4, 5, and 6.

[ByteStorm]

I would assert that option number two is preferable, considering the configuration and routing of the wire.

[ForumGuru]

I was examining that item but confused it with the 20; it is, in fact, a cable tie.😂

[ByteStorm]

A common error with BMW parts schematics.