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BMW 328 E46 ECU DME, Siemens MS42

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BMW 328 E46 ECU DME, Siemens MS42
Dealer Price: $1,186.02
Exchange Price: $399.00 Outright Sale Only
Repair Price: $499.00
Warranty : 5 Years


BMW 328 ECU / DME Location

BMW 328 ECU Location

This BMW 328 ECU DME fits BMW's with a E46 chassis from 2000 Only.

Common Symptoms of a Bad BMW 328 ECU:

  • The car cranks but doesn't start
  • EML light on
  • Check engine light on
  • Poor idle or running rough
  • The car goes on "limp" mode
  • No Throttle response but car starts and idles
  • Various misfire codes
  • Coolant leakage cause damaged to the DME connector harness
  • MDK output stage shut-off after diag error
  • Control unit self-test engine throttle or internal fault


When you choose the repair service you send your unit to our location. Once we receive the unit, we test and diagnose the unit. Then we repair it, if it is needed, and we send it back to you with a report of what caused the unit to go bad.  

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


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

How locate and remove the EWS 3 in your BMW



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 buy the unit Outright, we will send you a Rebuilt BMW Siemens MS42 ECU in a "virgin" state.

This means that it will be ready to "get married" to your car's security system, also called EWS. This procedure is also called doing an "alignment" or "synchronization".

This process takes only 2 minutes and it's done with a BMW compatible scanner. We include instructions of this process in the box.

Afterwards the unit will be "married" to your car and start it every single time.


  1. We will need your Car's VIN Number to program ECU before we can ship it.
  2. The type of transmission your car has : MANUAL or AUTOMATIC.

In the industry there are many misunderstandings about BMW ECU / DME 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 reprogram, re-code, or swap a used BMW ECU between cars. How can you help me?

We reverse engeneered these ECUs so that now we can re-program any ECU to your car using your VIN number.

Why can’t I buy a used BMW ECU and install 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"?

BMWs have an EWS (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. 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 unit to work in the car, a DME to EWS Alignment/Synchronization has to be carried out.

This is done using a BMW scanner like a GT1, ISTA, Autologic, Launch X431 or Baum Tool DS2021. It takes 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".

To learn more: Reprogrammed Rebuilt BMW ECU DME Explained

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