BMW 6 Engine Stalls & Secondary Air Pump Issues

Hey there! I dealt with nearly identical issues on my 2014 BMW 4 Series last summer. The symptoms you're describing match what I experienced, rough idling, stalling, and that annoying check engine light. After a thorough check, it turned out the hose connecting the secondary air pump to the valve was damaged and leaking. The rubber had deteriorated and created a poor connection, causing those erratic behaviors. The repair involved replacing both the hose and the valve since they'd worn out together. While it wasn't a catastrophic issue, leaving it unfixed could've led to more serious engine problems down the line. I'd suggest getting this checked soon, these symptoms don't typically resolve themselves and could worsen. The repair was straightforward for my mechanic, took about half a day to complete. Just make sure whoever works on it has experience with BMW secondary air systems. Best of luck with the repair.

Thanks so much for sharing this, it's really helpful to hear about your similar experience! This sounds exactly like what I'm dealing with, especially the symptoms you mentioned. Did you happen to remember roughly how much you ended up paying for the repair? Also, just curious, have you had any other issues pop up since getting it fixed? Really appreciate your detailed explanation about the hose and valve replacement.

Hey again! Happy to give you an update! Since my last post, I went ahead and got it fixed, turned out my initial guess about the hose connection was spot on. The mechanic charged me 175€ to sort out that faulty connection between the pump and valve. Money well spent, if you ask me! Haven't had a single problem since the repair, no more check engine lights, no stalling, and the engine's running smooth as silk. The secondary air system's working exactly like it should now. Honestly, I was pretty relieved it wasn't anything more serious! The actual fix ended up being simpler than I'd worried about, mainly just that dodgy hose connection playing up. My advice would be to get it sorted sooner rather than later. These kinds of issues tend to cause more headaches (and cost more) if you leave them too long. Let me know how you get on with yours, always interested to hear if others have similar experiences with their BMWs!

Thanks for the update! Really glad to hear it worked out well for you. Actually, I bit the bullet and took mine to a new mechanic yesterday. You were right about the hose, that was exactly the problem! Cost me about the same as yours, and they fixed it in just a few hours. The funny part was when the mechanic showed me the old hose, it was completely shot! Can't believe such a small part caused so much trouble. The engine's running beautifully now, no more jerking or stalling. The check engine light's finally off too, what a relief! I was nervous about trying a new mechanic, but this guy really knew his stuff. He even showed me what to look out for in the future. Guess sometimes you just need to take that leap of faith with a new repair shop. Thanks again for your help, it definitely made me feel more confident about getting it sorted!