BMW 3 Series NO Start NO Cranks DME Relay Fault Troubleshooting Tips

BMW No Start or No Crank? Check This Overlooked Fault! (E90/E91/E92/E93 DIY Guide) 🔧 In this video, I’ll walk you through a commonly overlooked area that may cause a no crank or no start issue on your BMW 3 Series—specifically for the E90, E91, E92, and E93 chassis. I'm working on my 2010 BMW 335D (M57 diesel), but this applies to many other models as well. We’ll inspect the DME relay (ECU relay)—a small, inexpensive component that can create intermittent starting issues, random codes, and more. I’ll also show you how to safely remove the ECU box, check for corrosion, and apply protective cleaner to help prevent future electrical problems. ✅ This tutorial includes: Full step-by-step disassembly and access instructions Safety tips for working with your BMW’s electrical system How to identify and test the DME relay Preventative maintenance tips using DeoxIT D100L Reassembly guide with torque-saving tricks 🧰 If your BMW won’t crank or start, don’t skip this check before replacing major parts. Save time, money, and frustration! Website: http://4diyers.com Patreon: https://www.patreon.com/4diyers Facebook: https://www.facebook.com/4diyers Twitter: https://twitter.com/4DIYers Instagram: https://www.instagram.com/4diyers/ Tumblr: http://4diyers.tumblr.com Pintrest: https://www.pinterest.com/4diyers/ Thank you to all those who watch my videos and support my content. Don't forget to subscribe to my channel for future tutorial videos and like my video if you found it helpful. New videos are always being uploaded every week! © 4DIYers 2013 All Rights Reserved No part of this video or any of its contents may be reproduced, copied, modified or adapted, without the prior written consent of the author.