BMW 4 Series Rough Start and Power Loss Troubles

Hey there! I had nearly identical issues with my 2016 BMW 3 Series last month. Same symptoms, rough start, power loss, and check engine light. Turned out you're on the right track, it was indeed a faulty camshaft position sensor. Got it checked at my garage and they found the sensor connector had corroded, causing intermittent signal issues. The mechanic showed me the damaged part, and it was pretty obvious once I saw it. They replaced both the sensor and the wiring harness connection since they often fail together. Not a catastrophic issue, but definitely needs fixing soon to prevent potential engine damage. My car runs like new after the repair. The job took about 2 hours total. Just make sure they check the wiring connections too, not just the sensor itself. Some shops miss this and then you're back with the same problem in a few months. Best of luck with the repair.

Thanks for sharing your experience! That's really helpful to know about the wiring harness connection, I'll definitely bring that up when I take it in. Would you mind telling me roughly how much you ended up paying for the whole repair? Also curious if you've had any other issues pop up since getting it fixed?

Hey again! Just wanted to follow up, yep, got it all sorted out! Took your BMW issue really seriously after our chat, and you'll be glad to know it was exactly what I thought, the camshaft sensor was acting up. Only difference was, in my case, it turned out to be just a dodgy cable connection that needed fixing. The whole thing set me back 95€, which honestly wasn't as painful as I expected. Since getting it fixed last month, my 3 Series has been running smooth as butter, no problems, no warning lights, nothing. It's like having a completely different car! Trust me, once you get yours sorted, you'll feel the difference right away. My mechanic really knew their stuff and pointed out that these sensor issues can be tricky, sometimes it's not the sensor itself but just the connections playing up. Been driving it daily since the fix, and it's perfect. Let me know how you get on with yours!

Thanks so much for the detailed follow-up! Just got back from the mechanic today and wanted to share my experience. You were spot on about getting it checked out quickly. Turns out my issue was a bit more complex, both the sensor and the wiring harness needed replacing. The mechanic was really transparent about everything, showed me the corroded parts, and explained why both components needed replacing. Cost me a bit more than yours at 280€, but honestly, seeing how the car runs now, it was worth every penny. Took it for a test drive afterward, and what a difference! No more rough starts, the engine's running smoothly, and that annoying check engine light is finally off. Such a relief to have this sorted. Really appreciate your advice about checking the wiring connections, that definitely helped me ask the right questions at the shop. Thanks again for helping me avoid getting ripped off. Time to enjoy my BMW running like it should!