Possible causes

– HO2S12 and HO2S22 sensors harness is open or shorted
– HO2S12 and HO2S22 sensors circuit connectors (wrong connection)
– Faulty Engine Control Module (ECM)

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0041 BMW Description

The heated oxygen sensor (HO2S) monitor determines if the HO2S signal response for a fuel shift corresponds to the correct engine bank.