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BMW 540 E39 ECU DME, Bosch 0261203474

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BMW 540 E39 ECU DME, Bosch 0261203474
Dealer Price: $1,186.02
Exchange Price: $300.00 + $100 Core Charge*
Repair Price: $415.00
Warranty : 5 Years

Core Deposit: 

This BMW 540 ECU DME fits BMWs with a E39 chassis with EWS from 1994-1999.

Here's a few Common Symptoms of a Bad BMW 328 ECU:

  • The car cranks but doesn't start
  • EML light on
  • Check engine light on
  • No Fuel or Spark
  • No Signal to the Injectors
  • Various misfire codes

BMW 540 DME / ECU Location

Jaguar XJ8 ECU ECM Location


First, we send you an rebuilt ECU from our stock. Once you receive our ECU, you send us back your damaged ECU core. For your convenience, we include a prepaid UPS Return Label in the box.

Special Instructions:

1. We will need your car's VIN Number to program the ECU.

2. Transmission type; Automatic or Manual.

3. DME to EWS alignment/synchronization needs to be done on this ECU with the Exchange Service. This is a simple 5 minute process which "marries" the DME to your car.

Your local independent BMW mechanic or dealership can do this in 5 minutes using their BMW Scanners.

What'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 immediately 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.

ECUs returned in non-rebuildable condition, such as heavy water damaged, fire damaged or manipulated ECUs, may receive a partial refund, or no refund at all.



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 DME Set:  BMW DME / ECU, EWS ,One of the car's Keys

How do I send the ECU for Repair?

Step 1: Click the orange "Fill Repair Form" button
Step 2: Fill out the form.
Step 3: Print the email confirmation.
Step 4: Send the Repair Form along with your ECU

When we receive the unit, a technician will call you to follow-up on the repair.

What's the Turnaround time on a Repair?

Repairs take between 3-5 days once we receive the unit at our offices.

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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