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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > MSD80 to MSD81 DME Questions



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      03-12-2018, 03:35 PM   #1
Cyrix2k
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MSD80 to MSD81 DME Questions

I recently purchased a 9/07 build 2008 335i not knowing the early '08s received the MSD80 DMEs. I'd like to switch to the newer MSD81 so that I don't have deal with the MSD80 mosfet problems (have a set on the way just in case). How does this affect emissions readiness? I've read that used MSD81s cannot have their VINs updated. Here in Maryland, we use an OBD-II emissions test that also pulls the VIN. Will this emissions test reflect the used DME's VIN or does another module (junction box?) report the VIN instead. Any help is most appreciated!
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      03-12-2018, 05:59 PM   #2
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I have 4/2008 335i with swapped msd81 linked via INS and still showing donor VIN and build date. No issues with emission testing in IL. I think that they scan the bar code on the door pillar for the VIN as OBD doesn't give that info. Maybe in your state would be different but I doubt it.
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      03-12-2018, 06:45 PM   #3
Cyrix2k
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Thanks for chiming in. I have two options for the test: 1) 24 hour kiosk that is completely automated via OBD-II. This is my preferred method. 2) Traditional station test. They still plug an OBD-II scanner in, but this test includes a visual inspection.

If I'm reading the OBD-II spec correctly, mode 9, PID 1 provides the VIN. https://en.wikipedia.org/wiki/OBD-II_PIDs Some of the official literature I've found states "Once communication is established, the VEIP test equipment queries the appropriate ECUs. Monitor readiness, MIL status, active codes (if MIL is “ON”) and VIN are among the data requested and examined during the test." I have no idea what happens if the VIN doesn't match. Voluntary testing exists where the test is run but the results don't count. I'm really curious what would happen...
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      03-13-2018, 12:14 PM   #4
JuniorB
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This is also my concern when I swap my n52 with a n54. Swapping over to msv80 from msv70, that it's going to read the donor car vin. Here in RI, it's obd plug in. I've seen in other treads that the ecu can be re written with your existing vin.
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      07-15-2018, 12:14 PM   #5
Rollintwinturbo
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Hey I got a 07 335i with the msd80 my mosfets went out so I ended up buying a msd81 people say you can’t just swap that you have to get it coded or the car won’t start is this true
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      07-15-2018, 10:54 PM   #6
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Not sure if it will do it, but I think the new Bimmergeeks ProTool app should let you change the VIN. I wish it could do ISN writes, but that takes too much money out of the Autohex pockets.

Rollintwinturbo - you need it more than coded. You will need to send your existing keys and CAS module along with the MSD81 to the programmer (or just the CAS and keys if getting the DME from them). They will marry the new DME to the CAS so the car will run. Most of the websites charge in the $4 - 500 range for this service, but I've found some on ebay that will do it for $200.

Another thing to note is that MHD is tied to VIN. I believe you can email Martial and they will transfer your license to the new DME if needed.
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      07-15-2018, 11:04 PM   #7
Rollintwinturbo
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I got the msd81 off a friends wrecked car and it came with the cas and two keys he said long as I use the same cas the came with it the car would run
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      07-16-2018, 09:32 AM   #8
Boland01
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On our 2007 the MSD80 gave up the ghost. The BMW dealer replaced it with a MSD81. Bad news it wasn't cheap though.
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      07-24-2018, 12:45 PM   #9
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Just replace the MOSFETs on your MSD80. It's quicker, cheaper, will provide the exact same result (a working DME) and a lot less headache IMO.

You keep your VIN, your keys (CAS), no coding, and get your emissions done on time.
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      07-24-2018, 09:14 PM   #10
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Quote:
Originally Posted by catcher22 View Post
Just replace the MOSFETs on your MSD80. It's quicker, cheaper, will provide the exact same result (a working DME) and a lot less headache IMO.

You keep your VIN, your keys (CAS), no coding, and get your emissions done on time.
Plus, MSD80 does map writes faster (which is weird since its K-line instead of DCAN.)
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