Mercedes Citan Diesel Engine Trouble

That sounds familiar I have a Mercedes Citan as well I had similar symptoms – check engine light, rough idling, and a noticeable power loss It turned out to be a faulty fuel pressure regulator Replacing it sorted everything out Although, my mechanic did mention checking the fuel system thoroughly to rule out other potential issues before replacing the fuel regulator He also checked the pressure sensor It might be worth investigating the error codes to see if they specifically point to the fuel regulator Could be a coincidence with the fuel filter change

When your regulator went bad, did you also have any engine misfire codes Was the replacement straightforward, or did your mechanic run into any snags with the fuel rail or anything else in the fuel system I'm trying to gauge how involved this repair might be and if it's something I could potentially tackle myself or if I should just take it to a shop

I can't say for sure if I had engine misfire codes specifically, but the error codes definitely indicated a fuel pressure issue I didn't do the repair myself From what my mechanic said, it wasn't overly complicated, but he did mention needing some specialized tools for the fuel rail connections Given the potential for fuel leaks and the importance of proper fuel pressure, he advised against attempting it without experience If you are unsure, perhaps it is better to go to the workshop

Sounds like it's best to leave this one to the professionals Just got it back from the shop – you were spot on Fuel pressure regulator was indeed the culprit 45€ and a bit of labor later, and she's running like new again Thanks for sharing your experience