BMW 1 Series Rough Start & Power Loss, Fix Needed

I had almost identical issues with my 2017 BMW 2 Series diesel last winter. Started with rough idling and power loss just like yours. The diagnostic showed similar fault codes. Initially thought it was the camshaft sensor too, but turned out to be a faulty wiring connection to the crankshaft position sensor. The mechanic found corroded pins in the sensor plug connection, which caused intermittent signals. Fixed it by replacing the entire wiring harness and connector assembly for that section. Wasn't a major repair in terms of engine work, but it needed proper diagnostic equipment to pinpoint the exact issue. Just my mechanical experience, but worth checking the wiring and connections before replacing sensors. These symptoms can be misleading. Make sure whoever works on it has experience with BMW diesel engines specifically.

Hey, thanks for sharing this. That's a really useful insight about the wiring harness, wasn't expecting that to be the culprit! By any chance, do you remember roughly how much you ended up paying for the whole repair? Also, has everything been running smoothly since then, or have you noticed any other quirks pop up?

Hey there! Happy to give you an update. Got the car back from the mechanic last week, and you'll be glad to know it was actually the Camshaft sensor acting up, but not in the way we initially thought. The issue was just a damaged cable connection to the sensor, not the entire unit itself. They fixed the faulty connection for 95€, which was way less than I expected to pay. Much better than having to replace the whole sensor! The car's running like a charm now, smooth starts, proper power delivery, and no more check engine light. It's amazing how such a small connection issue can cause so many symptoms, right? And to answer your question about other issues, nope, everything's been perfect since the repair. My 2 Series is back to its old reliable self. Just goes to show that sometimes the simplest fix is the right one. Definitely worth getting a proper diagnosis rather than jumping to replace parts! Glad I could help you out with my experience. These BMWs can be tricky, but usually, it's nothing too major once you find the real cause.

Thanks so much for the detailed follow-up! Just got back from my mechanic today actually. You won't believe it, my issue turned out to be related to a clogged fuel filter and some dirty injectors. Not at all what I initially suspected! Repair cost me about 300 bucks in total, including parts and labor. The mechanic cleaned out the entire fuel system and replaced the filter. Pretty reasonable considering I was bracing myself for a much bigger bill. Car's running perfectly now, no more rough starts or power issues. Really glad I didn't jump to conclusions about the camshaft sensor. Sometimes the obvious answer isn't always the right one, right? Thanks again for helping me think this through. Time to enjoy my smooth-running BMW again!