[soulcrusher]

My DME failed and gives a 30BB error. Anyone selling the part or know someone that is selling. Must be pulled from a 335i. To be safe, automatic transmission and RWD.

[update]: MOSFET repair did not fix the error

[stewbets]

Time to replace some MOSFETS! Are you familiar with the process for checking them? It's really easy.

[soulcrusher]

They tested fine. Changed them incase it was a false negative. Still have the error

[stewbets]

Bummer. That took care of it for me. I seem to recall reading that sometimes a persisting 30BB code could mean the injectors also got wiped out.

Here it is:

https://www.n54tech.com/forums/showthread.php?t=45615

[Cyrix2k]

FYI, I have an MSD81 from a 535i in my car. Works fine, no codes but it will need to be flashed & coded to your car (still applies for one from a 335i unless you buy a DME/CAS/keys set).