E46 Cylinder 2 Misfire

Hmmm, I read 'BTS2140-1B'.

They are readily available on Aliexpress, but no datasheet exists. Of course the sellers there have no idea what the part is. That usually means it was a bespoke custom part, and they are selling board pulls or production spares that have been sold off as surplus.

Often it is the same as another part in the manufacturer's product line, but with a carefully tracked supply chain and few production changes. They'll make a zillion of them at once so that they are all identical, store them in a warehouse in case of future sales, and put them in e-waste when they are definitely not going to sell them.

It's not clear if its a N-channel FET or an IGBT. I see a claim that it's the same as the BTS132 (N-FET), and another one where it crosses to a STGB10NB37LZ (IGBT) or 14CL40. I expect that it's an IGBT.

The new DME has fixed the issue. Cylinder 2 is now firing!

I successfully got it done the way I intended (with EWS still intact) by using my original DME files (Full + Partial) and patching "Clear Immobilizer Data" in TunerPro and flashing with JMGarageflasher / Galletto and then syncing with INPA. So now I have an absolute 1:1 clone of my original DME! I had some hiccups due to my original files I pulled being corrupted in some way, so anyone reading this going through a similar situation please confirm that your files are what they should be!
I couldn't find a ton of information on this online, so here is what I went through and the symptoms / how I fixed to help people in the future.

Symptoms:
Cylinder 2 Misfiring, compression test came back fine, fuel injectors were fine, wiring was fine, but cylinder 2 was not receiving spark.

Visually inspecting inside the DME I could see an obvious burn mark on the back plate, and what sits above that is a coil driver that drove cylinder 2 to spark. Testing using a multimeter, it was clear that component of the DME was no longer functioning as intended:
https://www.youtube.com/watch?v=rm2fsq0-j9s

Unsuccessful fix:
Bought a replacement coil driver and soldered it to the board, but did not fix the issue. Something else had also happened to my DME throughout the chaos that ensued to cause the component to fry.

Successful fix:
1. Bought a used MS43 DME off of eBay for my car (5WK90019 7536649 in my case) note: you will also need an INPA cable to continue if you are using this as a mini tutorial.
2. Pulled the Full + Partial files using JMGarageflasher and Galletto 1620
Credits to this video on how that was achieved:
https://www.youtube.com/watch?v=BFwdIiqxtbk

3. Downloaded TunerPro as well as the community patchlist XDF and loaded that to TunerPro.
4. Opened the Full (512kb) file in TunerPro and patched "Clear Immobilizer Data" then saved the changes to file.
Image for reference:


5. Flashed the Full 512kb file using JMGarageflasher and the Partial 64kb file using Galletto 1620.
6. Opened INPA, went to E46->Engine-> EWS -> Sync'd
7. Car was repaired! :clap:

Additional references:
https://forum.e46fanatics.com/showthread.php?t=1082287
https://www.ms4x.net/index.php?title=Main_Page