BMW 1 Series Diesel Misfire: Reset Quantity Issues

Hey there! I have some experience working on cars, and actually dealt with something very similar on my 2015 BMW 2 Series diesel last year. The symptoms you're describing sound exactly like what I experienced with my 220d. I had rough idling and misfires, and it turned out one of the injectors was faulty. Took it to my regular workshop and they diagnosed a defective injection valve. The whole repair including parts and labor set me back about 515 Euro, but it's been running perfectly since then. Before I share more details about my repair process, what's your exact engine variant and current mileage? This could help determine if you're facing the same issue I had with my 2 Series. Let me know these details and I'll be happy to provide more specific insights from my experience.

Thanks for sharing your experience! I have the same symptoms you described. My mileage is currently at 16240 KM and I just had my regular service last month. This issue started happening right after a cold morning start. The rough idle gets worse when the engine warms up. Based on what you're saying about the injector, I'll have my mechanic check that specifically. Did you notice any decrease in performance or unusual noise before the injector completely failed? Just trying to figure out if I should drive it to the shop or have it towed to avoid any potential damage.

Hey again! Thanks for the follow-up. Those symptoms do sound eerily similar to what I experienced with my BMW 2 Series. Since you asked about the pre-failure symptoms, yes, I actually noticed a gradual decrease in performance about a week before things got really bad. There was this subtle vibration at idle that I initially brushed off, and fuel consumption started creeping up too. In my case, I decided to drive it to the shop when the symptoms were mild, but looking back, I probably should've had it towed. The rough idle got significantly worse during that drive, and I was pretty nervous about causing additional damage. Given your mileage is relatively low at 16240 KM, I'd definitely recommend getting it towed just to be safe. When my injector failed, it wasn't just the injector that needed replacing, it had started affecting other components due to the uneven fuel distribution. Better safe than sorry! By the way, after my repair, I learned it's pretty crucial to use high-quality fuel and keep up with fuel filter changes to prevent injector issues. Haven't had any problems since implementing that advice. Hope this helps with your decision-making!

Thanks a lot for the detailed advice! You've convinced me, I'll definitely get it towed to the shop rather than risk driving it. Better to spend a bit on towing than potentially cause more expensive damage. I actually hadn't thought about the fuel filter maintenance, so that's really helpful information for preventing future issues. I'll make sure to mention everything you've shared when I talk to my mechanic. I'll update once I get it sorted out. Really appreciate you taking the time to share your experience, it's helped me understand what I'm dealing with much better!