[tsarty]

Hi, I was hoping someone could shed some light on a question I'm finding difficult to answer. I have a 22 x3 m40i, and would like to buy a second DME to have married to the car/ tuned for an ethanol blend. Because of travel, I don't always have ethanol available, and with the lack of a flex fuel kit for these cars, this seems the way to go. That being said, do the DME's work across all years of the same model? If I bought a 2020 DME, could I have it programmed to work on my 2022? I appreciate the insight on this.

[mattsheng]

Well, before talking about the compatibility issue, I'd like to say that DMEs are component protected (CP) so each time you swap your DME it will get locked and it is a hassle to get them unlocked. So is it worth it?

Now compatibility issue. Not all MY will work. MY18-19 have B58TU0 engines while MY20-23 have B58TU1 engines and they use different DME. B58TU0 runs DME 8.6.0 while B58TU1 runs DME 8.6T0.

As far as I can tell, there are 2 part numbers for MY20-23 X3 M40i DME: 12149897837 and 12145A059D8. These 2 DMEs are also used in many other platforms, e.g. M340i, M440i, 540i, etc. I would stick with the same part number that is listed on your DME just to be sure.

[tsarty]

Thank you for the reply and the part number. I had been searching for the DME by the nomenclature on my vehicles DME and could not find any info.

So basically if I bought another DME, had it married to my car, each time I switched the DME out, it would relock itself?

Hopefully someone comes out with a true flex fuel kit for the 22 and up cars.

[mattsheng]

Originally Posted by tsarty

Thank you for the reply and the part number. I had been searching for the DME by the nomenclature on my vehicles DME and could not find any info.

So basically if I bought another DME, had it married to my car, each time I switched the DME out, it would relock itself?

Hopefully someone comes out with a true flex fuel kit for the 22 and up cars.

Yup, at least that's my understanding of how CP works.