BMW 7 Series Stalling: Fuel Pressure Sensor Problems?

Hi there! I have some experience working on BMWs. I dealt with very similar symptoms on my 2003 BMW 5 series last year. The issues you're describing sound exactly like what I experienced. After taking it to my trusted mechanic, it turned out to be a loose connection on the wiring harness going to the fuel pressure sensor. The repair itself was pretty straightforward, they found the faulty connection, replaced the damaged wiring, and properly secured everything. Cost me 95 Euro and solved all those symptoms completely. Before investing in new parts, I'd definitely recommend having the wiring connections checked first. These symptoms can be misleading, and it's easy to replace parts unnecessarily. Could you share if you've had any other warning lights or noticed any other symptoms? Also, what's the mileage on your 7 series? This info would help determine if your case might be similar to what I experienced.

Hey, thanks for sharing your experience! My car has 62204 KM, and I just had my last service about three months ago. What you're describing does sound similar to my situation. I haven't noticed any other warning lights besides the engine light. I'll definitely have someone check the wiring connections before jumping to replace the sensor. Good to know it might be something as simple as loose wiring, definitely better than having to replace the entire sensor unit! Did your car also have that jerking sensation during acceleration before you got it fixed?

Hey again! Yes, my 5 series definitely had that same jerking sensation during acceleration, it was really frustrating! It would especially act up when trying to merge onto highways or pass other cars. That jerking was actually what worried me the most before I got it fixed. Just to add to my previous experience, when the wiring issue was happening, I also noticed the jerking was worse when the engine was cold, especially in the morning. After they fixed that loose connection, the car went back to running smooth as silk. The fact that your symptoms started showing up just three months after a service is interesting, sometimes these connections can work loose over time, especially with normal engine vibration. I should mention though, while my issue was just a loose connection, these symptoms can sometimes be tricky to diagnose. The fact that your mileage is relatively low (mine was at 98000 km when I had the issue) makes me even more suspicious of a connection problem rather than a sensor failure. Quick question, have you noticed if the problems get better or worse depending on whether the engine is warm or cold? This might help narrow things down based on what I experienced.

Thanks for that detailed follow-up! You know what, now that you mention it, I've definitely noticed the jerking is way worse when the engine's cold. The car runs a bit better after warming up, though still not great. That's really interesting about your experience with the cold starts, sounds exactly like what I'm dealing with. Feeling much more optimistic now knowing it might just be a wiring issue! I've already called my mechanic and scheduled an appointment for tomorrow. Will ask them to specifically check those wiring connections first before jumping to any sensor replacements. I was honestly worried this was going to cost me a fortune, so hearing about your relatively simple fix is a huge relief. I'll update the thread once I get it sorted out. Thanks again for all your help, you've saved me a lot of worry and potentially unnecessary expenses!