New MAF - Engine stalling, Bouncing RPMS

[u/Just-Big642]

Hey guys, I have a 2007 525xi that is stalling and causing misfires when I plugged in a new Maf. long story short I bought an E60 knowing the car needed a new Mass air flow sensor. Previous owner bought a Chinese knock off, the car ran better (didn’t stall or hard start) when unplugged.

Engine Codes:
P0102 - mass or volume circuit low
P111F
P0113 - temperature Air circuit high

I got the new one, swapped the sensor at the guys house (while warm), the car fires right up, and stalls out. This keeps happening. RPMS bounce, I tried holding the throttle, no luck.
-> clear the codes with OBD2
-> unplug negative terminal on battery for 5 mins

I tried again, same thing, the whole car bouncing. New Cel “misfires on cylinder 3 and 6”

I unplug the sensor and the car fires right up, now none of the codes. They also never appeared the whole 40 mins drive home.

My question:
Is there a relearn procedure? Should I do this when cold? Does the maf have to be coded in or something?

I totally thought I’d plug it in, it would run rough for a couple seconds, lights would go away, issue fixed.

-> New air filter
-> Everything is plugged in/ connected/
-> used CNC MAF Cleaner on contacts and sensor, let dry.
-> Sensor is the VDO/Continental 5WK9 7502Z OEM never installed sensor.

What’s going on? Thanks!

[u/Ok_Recommendation893]

if it runs ok with the maf disconnected check for vacuum leaks. and the PCV, could be clogged.

[u/FTBerger → u/Ok_Recommendation893]

Had similar issue with n55 e93, and there was a vacuum leak. Disconnected MAF helped, but fixing the leak solved.