Mercedes M Klasse Diesel Engine Starting Issue

Sounds familiar. I had a similar Mercedes M Klasse, though I don't remember the exact year. I had a similar car won't start issue with that exact error code. Did you check the fuse box and the relay switch?

Thanks for the hint. Where is the relay switch located, and which fuse box should I focus on? Should I expect visible damage, or do I need to measure something specific? I don't have much experience with these things.

Well, in my case, it was difficult to find. Instead of causing more issues, perhaps you should consider a workshop. They will measure voltage drop and identify the faulty component.

Thanks for the help. I ended up taking it to a shop as you suggested. Turns out it was a corroded connector. The repair cost was 95€, as initially suspected.