HFM Mass Airflow Sensor, BMW - F10, F13, F02, E70, E71, N63A

This part is listed by BMW as BMW part number 13628645877 (13 62 8 645 877) and is described as HFM Mass Airflow Sensor for BMW F10 550i, F13 650i, F02 750i, E70 X5 50i, and E71 X6 50i with the early N63A V8 engine. This is the HFM listed in the N63 Customer Care Package. However, BMW shows this has been superseded to part #13627566990 (which is also shown as unavailable to order). Our speculation is that this HFM is available on its own to replace the one used in the N63 CCP. We're not sure if there are any differences or if one is better than the other.

The HFM (Hot Film Meter, or MAF sensor) measures air density and temperature so the engine computer can make fuel adjustments on the fly. There are several possible failures with an HFM and not all will trigger a fault code. Poor sensor data can make the car run rough, surging idle, poor drivability, and decreased MPG. First try cleaning the HFM and inspect all of the intake boots for cracks or loose fitment. If problems persist it may be time for a new HFM.

In our view, a Genuine BMW HFM has stricter tolerances and better performance than any other brand of HFM. If performance and expectations are your most-valued considerations, our recommendation is a Genuine BMW airflow sensor. It's worth the higher price for the better and more consistent performance. If price is a major factor, look to the OEM and aftermarket brands.

This is a Genuine BMW HFM with a two year warranty. Buying a Genuine part will usually be more expensive than an OEM or aftermarket brand but you are assured that it meets BMW's designs for fitment, performance, and longevity. It will also be the very latest design, incorporating any updates or revisions that an aftermarket brand typically will ignore.

For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.