How do I fit an ECU to my E34 BMW 520 ?

I have to fit an ECU to my E34 BMW 520, the one nearest the bulkhead. Is this easy to do or am I best to put it into a garage.

Any advice appreciated.How do I fit an ECU to my E34 BMW 520 ?If you're simply swapping out an ECU, then it's just a matter of locating the current location of the ECU (usually in a compartment in the bulkhead as you've mentioned), undoing the fasteners/screws, unplugging the unit, and putting the new unit back in the reverse order.



BUT... what year is your car? If you have BMW's EWS II (transponder key security), you will need to get the new ECU "aligned" with your current keys. This is done by the dealer.How do I fit an ECU to my E34 BMW 520 ?It is very easy, but you will need to find the proper ECU for the car. Most BMWs have ECU located under the hood, FL side of fire wall. The little blocked off housing that contains fuses, Light control module, and ECU. You just have to disconnect the electronic connector and slide it out. If it is not found in that location, you will have to lower the glove box to get to the ECU (Older BMW used this location)



The ECU is made by Bosch, and has the part number on the ECU case. You will have to find the replacement ECU that has the same part number.How do I fit an ECU to my E34 BMW 520 ?Physically fitting it is easy, making sure it works properly is less simple. Unless you are 100% sure I would use a garage.



Alternatively try using one of the many BMW based forums on the internet. There are lots of people out there who will be more than willing to help.



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