BMW 2-Series Loses Power, Cold Start & Fuel Issues Alert

Hey there! I had similar issues with my 2014 BMW 4 Series diesel last winter. Started with sluggish performance and higher fuel consumption, then got the check engine light. My original mechanic missed the root cause, turned out the injectors were failing because of a faulty fuel pressure regulator. The bad regulator had been slowly damaging the injectors for months. Had to get both the regulator and injectors replaced since the damage was done. It was quite serious, could've led to complete engine failure if left unfixed. Definitely not something you want to ignore, especially with these diesel engines. Based on your symptoms, it sounds very similar to what I experienced. The cylinder pressure issues your mechanic mentioned could be related to fuel delivery problems. Would suggest getting a second opinion from a shop that specializes in BMW diesels, specifically someone who can properly diagnose fuel system issues. Just my two cents from going through it myself. Best of luck

Thanks for sharing your experience! That's really helpful since I'm seeing such similar symptoms. The injector/regulator issue definitely sounds like it could be what I'm dealing with too. Would you mind letting me know roughly what the repairs set you back? Also curious if you've had any other issues pop up since getting it fixed? I'm trying to figure out if I should brace myself for a big bill and want to make sure I get it sorted properly this time.

Hey again! Happy to give you a follow-up! After dealing with my fuel system issues last winter, everything's running perfectly now. The whole injector/regulator situation cost me around 2,300 in total, not cheap, but worth every penny for the peace of mind. Actually, the best news is that when they diagnosed it properly, they found the cylinder pressure fluctuation you mentioned was just a consequential error from the faulty regulator. Once they fixed the main issue, that problem disappeared on its own, didn't cost me anything extra! The engine's running smoother than ever now, fuel consumption is back to normal, and no warning lights since the repair. Really night and day difference. Haven't had a single issue pop up in the months since, and my mechanic said the new parts should last the life of the car if maintained properly. Just make sure whoever works on yours knows BMW diesels well, it makes all the difference in getting it diagnosed and fixed right the first time. Let me know if you need any other info!

Thanks for all those details! Just wanted to update, I took your advice and found a BMW specialist. You were spot on, they diagnosed the same fuel system problems. Got it fixed last week and wow, what a difference! The bill came to about 2,100, which wasn't as bad as I'd feared after seeing what you paid. The mechanic showed me the old parts too, they were pretty worn out. Car's running like new now, starts right up in the morning and the power's back to where it should be. No more check engine light either! Actually glad I posted here, saved me from going back to that first mechanic who was probably going to charge me for unnecessary work. Thanks again for steering me in the right direction with this. Really appreciate all your help!