C30 Diesel Stalling After Fuel Filter Change

Sounds like you might have introduced air into the fuel system when you changed the filter. Did you prime the system properly afterward? A defective fuel pressure regulator could be the problem, especially with those symptoms. Have you checked the fuel rail pressure?

Priming... honestly, I'm not 100% sure I did it perfectly. I thought I did, but maybe not good enough. Where exactly is the fuel rail pressure sensor located on this engine? And what readings should I be looking for?

If you're unsure about the priming, that's a big clue. Messing with fuel pressures without the right tools can be risky. I'd say get it to a workshop. The error entry might just need to be cleared after a proper priming. It sounds like the regulator, but get it checked properly.

You were spot on! I took it to a mechanic, and they re-primed the system and cleared the error code. The fuel pressure regulator was fine. Apparently, I messed up the priming pretty badly. Cost me 45€ to get it sorted. Thanks for the help!