BMW 528 E39 ECU DME, Siemens MS41.1

PRICE: $599.00 Outright Sale ONLY


We have helped thousands of customers fully enjoy their cars again! Our dedicated team of engineers and their knowledge of the Siemens MS41.1 ECU makes us the best option to repair or Exchange your engine computer.

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


  • Engine starts then Stalls
  • Check engine light ON at all times
  • Engine Cranks but doesn't start
  • EML light come On
  • Cam and Crank sensor codes
  • Vanos related codes
  • Engine Misfires
  • Water damage and corrosion


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 Siemens MS41.1 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 unnecessary 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.
  • EWS OFF option available.




When you choose the repair service also called repair and return "R&R", you need to send your ECU SET to our location.

Once we receive your ECU SET , we will inspect, test and diagnose the units.

We perform bench and in vehicle testing for the ultimate reliability of diagnostics.

We will report our findings and under your approval we will repair the unit.We will also send you a report with the service performed and parts replaced.


When sending your unit for Repair, send us the ECU/DME Set:




Step 1: Click the orange icon "REPAIR FORM"

Step 2: Fill out the form.

Step 3: Print the email confirmation.

Step 4: Pack your ECU SET securely.

Step 5: Send the repair form along with your ECU SET.



The average time for the repair process is 3- 5 days once we receive the ECU SET at our office.


If you choose the exchange service, we will send you a Rebuilt Siemens MS41.1 ECU from our stock . Once you receive our rebuilt ECU, then send back your defective ECU core.


1. We will need your Car's year and Model to correctly program the Exchange ECU.

2. The type of transmission your car has : MANUAL or AUTOMATIC.

3. Once YOU receive the Exchange service ECU, you or the mechanic that is working on the car needs to do a ALIGNMENT OR SYNCHRONIZATION of the ECU - EWS - KEYS with an scanner tool that have that option . This is a less than 5 minute process that "MARRIES" the ECU to the other security modules to your car.

** EWS Off Upgrade is available for this ECU type , Please let us Know if you want this option at no cost**


coolWhat's the "Core Charge"?

The CORE CHARGE is a deposit that we collect to ensure that the exchange is completed. When we receive your ECU core at our office, we refund the core charge back to your credit card.

Your old ECU must be returned within 5 days of the delivered date in order to receive the refund of the core deposit . You may be subject to additional charges, in addition to a canceled warranty, if you do not return your old ECU within 5 days of receiving your new rebuilt ECU.

ECU's returned in NON-REBUILDABLE condition, such as HEAVY WATER DAMAGE, FIRE DAMAGE or PREVIOUSLY MANIPULATED ECU'S; may receive a partial refund, or no refund at all .

*FOR INTERNATIONAL SHIPMENTS ONLY* There is an additional $100 Core included in the shipping charges which count towards the core charge deposit. Once we receive the ECU core back, you will be refunded the original core charge plus the additional $100.


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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.