Hey DT I am sure you will teach me some valuable lessons on BMW management systems. My understanding of these systems is obviously not as deep as yours. In the case of the MAP your information explains why BMW refers to the sensor I call a MAP as a Air Temp Sensor (specifically 13-62-1-738-510) on a 3.0.

I have also seen that air boot tear on a couple vehicles, mine included. I don’t like the voltage problem on that O2 sensor and seeing that TSB makes me wonder how many O2 sensors I have looked at via OBD ll scan that showed no voltage were actually OK and the software was the problem. So far a replacement sensor has corrected the problem, but I’ll be sure to bench test them in the future to be sure.

I don’t have access to a BMW GT1 Diagnostic system, sounds like you may have access . I am no expert, in fact I search out forums that will improve my skills, I expect your knowledge will be appreciated my many here.

I don’t want to hijack the thread with my DISA question, but I have seen a couple of these that make noise and I can’t figure out how to test them. I don’t think it’s an OBD monitored unit and I cant really tell if they are working.

Thanks again for the clarification and good explanation.