BMW 530 E39 ECU DME, Siemens MS 45.1 M54 Engine

EXCHANGE PRICE: $899.00 Send-in Exchange  


We have helped thousands of customers fully enjoy their cars again! Our dedicated team and knowledge of the Siemens MS45.1 systems make us the best option for the repair or Exchange of your engine computer.

Our 5 year "Best on the market" workmanship warranty is included at no cost.


  • Outside Cold temperature affects car starting
  • DME Self Diagnostic: RAM Check failed Error
  • Engine Stalls
  • Engine Cranks but doesn't start
  • EML light come On
  • RPM speed limiting Error
  • Various misfires and Oxygen sensor codes
  • Electric fans not working


If you are reading this maybe your car is not running right anymore, perhaps not even starting .Your mechanic made the diagnostic that the ECU is not good and needs repairs .We Know all the "secrets" related to the MS45.1 ECU. We are the common sense alternative to help you get your car back on the road FAST!!

We have dedicated hundreds of hours to understand and correctly repair Siemens ECU's, When you choose our service we will correctly diagnose and advise if the ECU is really defective saving you time and money on unnecesary repairs and mechanics labor We have dedicated Bench tester and Physical vehicles were we will test, diagnose and properly program your ECU, ensuring that you will get a real Plug and play solution.


  • Visual inspection of critical areas in the circuit board.
  • Cleaning Dust, Debris or Corrosion from the unit.
  • Repair of associated problems and resolder of critical components.
  • 100% plug and play, no programming required.
  • 100% guarantee of bench and in vehicle testing.






When you choose our Exchange service option, you need to send your ECU Set to our location.

Please fill the service form located in the Orange service Icon.   

 Icon repair form

After filling up the required form please send us :

Make sure to carefully pack the modules, then send the Ecu set to our location.

Once we receive your ECU Set, we will inspect, and proceed with the needed readings from the EWS module in order to prepare the Exchange Ecu.

After we program the exchange Ecu along with the EWS and keys from your car, we will proceed to perform final testing in our dedicated tester vehicle to ensure 100% reliability and most important a plug and play operation once the ECU set is send back to you.

The average time for the Exchange service process is 3- 5 days once we receive the ECU Set at our office.

Our service is guaranteed to be plug and play once your receive it.

All work is done in House.



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GT1 Scanner - DME to EWS Alignment Instructions (PDF)
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Launch-X431 - DME to EWS Synch Instructions (PDF)
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General Technical ECU Troubleshooting Guide


In the industry there are many BMW ECU programming. We wrote a guide to help answer and give you solutions to some of the most commonly asked questions.

My Mechanic / Dealership says that you can't Re-Program, Re-code or swap a used BMW ECU between cars.How can you help me?

We have reverse engineered these ECU's and developed proprietary Equipment that allows us to Re-program used ECU's to your car's VIN Number.


Why can't i buy a used BMW ECU and installed myself?

Because if you install a used ECU in any BMW, the VIN number and "Rolling Code" will not match, and it will prevent the car from starting.With a used ECU the car might crank, but it will never get the "permission" to power the fuel pump and send the spark signals.


What is a "Rolling Code"?

BMW's have the EWS Module (anti theft device) that has a password feature called the "Rolling Code" which changes between the DME and EWS every time that the car is turned off. This makes it virtually impossible to swap used ECU's between BMW cars.


When I purchase an Exchange DME, will the unit be Plug and Play?

"NO". Our Exchange ECU's will be programmed to your BMW's VIN number and correct application. However, due to the fact that the EWS systems have a random "Rolling Code" we can't guess what this random code is. Therefore, we reset this feature to make the ECU "blank".

In order for the rebuilt ECU to work in the car, a ECU to EWS Alignment/Synchronization has to be carried out.This is done using a BMW scanner like a GT1, ISTA, Autologic, Launch X431,Baum Tool DS2021and others. It takes less than 5 minutes to "MARRY" the ECU to your car, and once that is done the ECU is ready to start in the car.


If you Repair my ECU, do you I need to “re-flash”, "re-code" or “re-program” the ECU before installing back into my car?

NO. ECU re-programming is not required because most repairs are done on the hardware parts and not on the software programming. Once we repair your unit, it will be 100% "Plug and Play" already tested in our actual Tester vehicle.