M2 Fuel Sensor Mayhem: Rough Running and Stalling Crisis

Had a similar issue with my 2016 BMW M4 last month. The symptoms were exactly what you're describing, rough idle, unusual stalls, and jerky acceleration. Turned out the fuel pressure sensor connector had corroded, causing intermittent signal issues. My mechanic found that the wiring harness near the sensor was also slightly damaged. Had to replace both the sensor and repair the harness. It wasn't just a simple plug-and-play fix, as they needed to verify the entire fuel delivery system was working correctly after the repair. While not the most expensive repair, it's definitely not something to ignore. A faulty fuel pressure sensor can lead to bigger problems if left unchecked. Could even damage your fuel pump or injectors over time. If you're getting these symptoms along with a check engine light, I'd recommend getting it checked soon.

Thanks for sharing your experience! That's really helpful to know about the wiring harness issue too. Mine's showing the exact same symptoms. Was wondering, 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! Glad I could help earlier. Just wanted to update you, I actually got my car fixed last week and it's running like a charm now! The mechanic confirmed it was indeed the fuel pressure sensor playing up, mainly due to a dodgy cable connection. The total bill came to 95 € for fixing the wiring issue, which was way less than I expected. Since the repair, my M4's been performing perfectly, no more stalling, rough idling, or that annoying jerking during acceleration. The check engine light's gone too, and honestly, it feels like I'm driving a different car. Such a relief! I know you mentioned being hesitant about mechanics, but getting this fixed sooner rather than later was definitely the right call. These kinds of issues can snowball if left unchecked, and I got lucky that it was just a simple wiring fix rather than something more serious with the fuel system. Really glad I didn't wait around on this one!

Thanks again for the follow-up! I actually bit the bullet and took my M2 to a different mechanic yesterday. You were spot on, it was the fuel pressure sensor and some wonky wiring. The total repair came to a bit more than yours since they had to replace the entire sensor unit, but honestly, it was worth every penny. The car's running beautifully now. No more stalling or jerking, and that annoying check engine light is finally off. The mechanic I found was really thorough and even showed me exactly what was wrong, which I appreciated. They found some minor corrosion around the connector that could've caused bigger problems if left unfixed. Such a relief to have this sorted! Really glad I didn't let my previous bad experience stop me from getting it checked out. Thanks for giving me the push I needed to get it fixed promptly. Time to enjoy driving again without worrying about unusual stalls!