Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

How to Replace the Onboard Computer Relay in a BMW 3 Series

Model: BMW Serie 3 E92, E90, E91 - Years: 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Part: Fuse box

See other generations:
Video tutorial

In this video, learn how to fix a BMW 3 Series that won't start or has electrical issues related to the engine control unit (DME/ECU). In this case, the problem could be the power relay, and we will show you how to locate and replace it. Always disconnect the battery before performing these operations! It is located in the fuse box under the hood, near the DME unit; however, in newer models, this fuse is found in the cabin fuse box, and the position varies depending on the year and model, so check the diagram printed on the inside of the cover, which you will remove with the vehicle turned off. It is a green/blue relay, often labeled as "DME Relay" or "K6300". In the video, it is the second from the left, but always verify with the manual; gently pull out the relay and insert the new one in its place, ensuring it is securely fastened.

Reattach the cover, reconnect the battery, and check that the vehicle starts normally.


Posted on 4 March 2026 by ScegliAuto


Related tutorials

How to Reset the Onboard Computer of the BMW 3 Series?
How to Reset the Onboard Computer of the BMW 3 Series?
BMW Serie 3 (2005-2013 / E92, E90, E91) To reset the onboard computer of the BMW 3 Series, turn the key to the "on" position to activate the instrument cluster, allowing you to use the radi…
How to Reset the Onboard Computer of a BMW 3 Series?
How to Reset the Onboard Computer of a BMW 3 Series?
BMW Serie 3 (2005-2013 / E92, E90, E91) To reset the onboard computer of the BMW 3 Series, turn on the instrument cluster by inserting the key into the ignition and pressing the button to a…
How to Reset the Onboard Computer of the BMW 3 Series?
How to Reset the Onboard Computer of the BMW 3 Series?
BMW Serie 3 (2012-2019 / F31, F30) In this tutorial, you will see how to reset the onboard computer of the BMW 3 Series, a very simple and quick operation, useful if the iDrive system …

Other guides you may be interested in

How to Remove the Rear Seat of a Hyundai Tucson?

To remove the rear seat of a Hyundai Tucson, follow these steps. Start by moving the front seats to their most forward position to gain space. Next, locate the release lever on the underside of the rear seat, near the floor. Press this lever down while pulling the seat upwards to unlock it from the anchor pins. Once unlocked, tilt the seat upwards and forwards to remove it from its position. Repeat this process for both sides of the rear seat. Be careful of any electrical cables or components that may be connected to the seat during removal. Once the rear seat is removed, the disassembly is complete.

Watch the video!


by ScegliAuto

More videos