What does RealOEM say when you enter your VIN and look at the exhaust section?
When I select the DPF parts, it says "No parts found matching your car." So no DPF was factory fitted and the retro-fitted DPF is not fitted either.
https://www.realoem.com/bmw/enUS/sho...diagId=18_0648
I think the factory-fitted DPF is monitored. The retro-fitted DPF is not.