BMW M2 Fuel Regulator Issues, Performance Problems Help

Hey there! I have some experience working on BMWs, and I actually faced something very similar with my 2019 BMW M4. The symptoms you're describing sound exactly like what I went through. After several headaches, my trusted workshop diagnosed it as a faulty high pressure fuel pump. Got it replaced, and it set me back about 1510 Euro, but the car runs perfectly now. No more stalling, power loss, or check engine lights. Just a heads up, what's your current mileage and have you noticed any specific conditions when these symptoms get worse? Also, are you getting any specific error codes? This info would help confirm if we're dealing with the same issue. If it is the fuel pump, don't wait too long to get it checked. These problems tend to get worse and could potentially damage other components. Would you mind sharing if you've had any recent fuel system maintenance or if you've noticed any other warning signs before this started?

Thanks for your detailed response! Currently at 19771 KM and just had my service last month. Everything was working fine until last week. I haven't noticed any specific patterns when the symptoms get worse, it's pretty unusual. Haven't pulled the error codes yet but planning to do that tomorrow. Good call about the high pressure fuel pump, I'll definitely get that checked out first. No recent fuel system work done, but I've been using the same premium fuel as always. I'm hoping it's just the pump and nothing more serious.

Hey again! Thanks for providing those details about your M2. You know, hearing about your mileage and the sudden onset of problems, I'm even more convinced it's the high pressure fuel pump. My M4 had almost the same mileage (around 21000 KM) when I ran into these issues. Since you mentioned using premium fuel consistently (just like I did), and the problems started suddenly after everything was fine during your recent service, it really mirrors my experience. My issues also seemed unusual at first, but I later noticed they were slightly worse during cold starts. Quick tip from my experience, when you get the error codes checked tomorrow, look specifically for codes P0087 or P0088. These were the ones I got, and they're typically associated with fuel pressure problems. My mechanic showed me that the pump wasn't maintaining proper pressure, which explained all those symptoms we both experienced. Just curious, have you noticed any slight hesitation when accelerating from a stop? That was another subtle symptom I had before things got worse. Also, does your engine sound slightly rougher than usual at idle? Keep me posted about those error codes when you get them. Really interested to see if we're dealing with the exact same issue here.

Thanks so much for all this helpful information! Now that you mention it, I have noticed some hesitation when pulling away from stops, but I initially brushed it off. And yes, the idle does sound a bit rougher than usual, I just checked after reading your message. It's honestly such a relief to hear someone else went through the exact same thing with such similar circumstances. Just got back from checking the error codes, and wouldn't you know it, P0087 showed up, just like you predicted. At this point, I'm pretty convinced it's the high pressure fuel pump too. Already made an appointment with my mechanic for tomorrow morning. They quoted me roughly the same price range you mentioned, which seems fair considering the part and labor involved. Really appreciate you taking the time to share your experience, it's helped me avoid a lot of potential guesswork and worry. I'll probably go ahead with the pump replacement and hopefully be back to enjoying my M2 properly soon!