BMW 6 Series Power Loss Mystery: Rail Sensor or More?

Hey there! I faced similar issues with my 2009 BMW 5 Series last month. The symptoms were identical, power loss, rough idle, and occasional stalling. After scanning, it turned out my fuel rail pressure sensor was indeed defective and needed replacement. The interesting part was that it wasn't just the sensor, there was a wiring harness issue connecting to it that was causing intermittent signals. The fix wasn't particularly complex, but it was crucial to get it done quickly as these symptoms can potentially lead to bigger fuel system problems if left unchecked. My mechanic showed me the old sensor, and you could see visible corrosion on the connection points. For diagnosis, I'd suggest getting a proper OBD scan first, the generic ones might miss BMW-specific codes. The fuel rail pressure sensor issue is fairly common in these models, but it's better to confirm before replacing parts. Got my 5 Series running smooth now, though I had to leave it at the garage for two days while they traced all the connections to ensure there weren't any other hidden issues. Hope this helps with your decision-making.

Hey, thanks for sharing your experience! That's really helpful since I'm going through something similar with my Bimmer now. Good to know it was fixable and wasn't something catastrophic. Just curious, 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 popping up? Would love to know what to expect if I go down the same repair route.

Hey again! Great news, I got everything sorted with my 5 Series! The repair cost me 240 € to fix the faulty rail pressure sensor, and honestly, it was worth every penny. Since seeing the mechanic, the car's been running like a dream, no more power loss, rough idling, or any of those annoying issues I mentioned before. The Rail pressure sensor signal fault has been completely fixed, and I haven't noticed any other problems cropping up since then. The engine's running smooth as silk now, and the check engine light hasn't made another appearance. It's like driving a different car! I have to say, if you're experiencing similar symptoms, don't wait around too long to get it fixed. These sensor issues can cause bigger headaches if you let them drag on. But once it's sorted, you should be good to go. My car's been perfect for daily driving since the repair. Just make sure you get a proper diagnosis first, it really helps avoid any unnecessary parts replacement. Let me know how you get on with yours!

Thanks so much for the detailed follow-up! I actually just got back from the mechanic today, and you won't believe it, my situation was pretty similar to yours. The diagnostic scan confirmed it was indeed the rail pressure sensor causing all the trouble. My repair bill came to a bit more than yours though, around 300 € because they found some worn wiring that needed fixing too. The funny thing is, when I first drove in, the car was making such weird noises that the mechanic thought it might be something much worse. But after running some tests, they pinpointed the issue pretty quickly. Had to wait around for a couple of hours, reading old magazines and drinking mediocre coffee from their waiting room machine, but it was worth it. The car's running amazingly now, no more strange noises or power issues. I'm just glad I asked here first and got your input. Really helped me feel more confident about what I was dealing with. Thanks again for sharing your experience, it definitely helped me make the right call!