BMW 2 Series Air Pump Issues, Help with Stalling Problems

Hey there! I have some experience working on cars and actually faced something very similar with my 2019 BMW 1 Series diesel. Those symptoms sound exactly like what I dealt with about 6 months ago! My engine was also stalling and jerking, and I had that annoying check engine light too. Turned out the hose connection from the pump to the valve was defective. Got it fixed at my regular workshop, cost me around 175 Euro, but it solved all those issues completely. Before suggesting anything specific though, could you share: How many miles/kilometers has your car done? When did these symptoms first start? Have you noticed any unusual sounds from the engine bay? I know these BMW air systems can be tricky, especially in the 1 and 2 Series. If we're dealing with the same issue, you might want to have that hose connection checked out.

Thanks for your reply! My car's at 126677 KM and just had its service last month. The symptoms started about two weeks ago, and yes, I'm hearing a whistling noise from the engine bay, especially when starting the car in the morning. Pretty sure it's coming from the front right side. Your experience with the hose connection issue sounds spot on, I'll definitely have my mechanic check that out. Really hoping it's just that and not something more serious. Did you notice any whistling sounds with your car when you had this problem?

Hey again! Yes, that whistling noise is exactly what I experienced with my BMW! When you mentioned it's coming from the front right side, it immediately clicked, that's the same spot where my problem was. In my case, the whistling was most noticeable during cold starts, just like yours. Given that your car's done 126677 KM, it's right around the mileage where these issues tend to pop up. My car had done about 115000 KM when I faced the same problem. The fact that it started after your recent service is interesting, sometimes these hoses can get disturbed during routine maintenance. When my mechanic dug deeper, they found that the hose had developed a tiny crack that was causing air to escape, hence the whistling. The crack was so small you could barely see it, but it was enough to mess with the whole air system. That's why the secondary air pump was acting up and triggering all those other symptoms. Quick tip, while you're waiting to get it checked, try to avoid hard acceleration as it puts extra stress on the system. I learned that the hard way when I ignored it for a few days! Let me know what your mechanic finds. I've got a feeling it's the same issue I had, especially with that whistling sound you described.

Thanks so much for all that detailed info! Really appreciate you taking the time to explain everything. The similarities between our situations are pretty uncanny, especially that bit about the whistling during cold starts and the mileage being so close. I've already called my mechanic and booked it in for tomorrow morning. I'll definitely mention the possibility of a cracked hose to them. You've saved me a lot of worry by sharing your experience, I was imagining all sorts of expensive worst-case scenarios! I'll follow your advice about taking it easy on the acceleration until it's fixed. The last thing I want is to make things worse. I'll update you once I get the diagnosis from the mechanic. Thanks again for your help, it's been super reassuring to know someone else has dealt with and solved the exact same problem!