Well, I think we can be pretty sure that the sensor is Continental's QLT sensor, as this presentation says BMW is a customer for the sensor on Page 47:

http://www.google.com/url?sa=t&sourc...hJaYvN1XEw5pMA

So, to summarize:

(1) The BMW sensor looks like the Continental sensor,

(2) BMW used the same "QLT" nomenclature in technical documents that Continental uses for the sensor, and

(3) Continental says BMW buys the QLT sensors from them.

OK, it's not proof, but pretty darned convincing!