Fixing BMW O2 Sensors

Feb. 27, 2023

This bulletin applies to 2015 BMW vehicles equipped with the N63T engine. The Service Engine Soon light may be on, accompanied by DTCs 12B701 (oxygen sensor heating after catalytic converter, function, internal resistance too high) and/or 12B801 (oxygen sensor heating after catalytic converter two, function, internal resistance too high). 

This bulletin applies to 2015 BMW vehicles equipped with the N63T engine. The Service Engine Soon light may be on, accompanied by DTCs 12B701 (oxygen sensor heating after catalytic converter, function, internal resistance too high) and/or 12B801 (oxygen sensor heating after catalytic converter two, function, internal resistance too high). 

Engine performance and operation may not be affected. The cause of the DCTs: the DME diagnosis for the post catalyst oxygen sensor(s) is too sensitive. According to BMW, do not replace any parts for this concern. Perform diagnosis with the latest version of ISTA, and re-program the vehicle using the latest version of ISTA/P.

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