BMW 3 Hybrid Stalling: Fuel Mix & Power Loss Nightmare

Hey there! I dealt with nearly identical issues on my 2012 BMW ActiveHybrid 5 last year. The symptoms you're describing match my experience perfectly, the power loss, rough running, and jerking were really concerning. Turned out two fuel injectors were defective and needed replacement. The problem was causing incorrect fuel mixture, which explained the emissions failure and rough running. Since it's a hybrid system, the issue was actually affecting both the conventional engine performance and the hybrid power delivery. Had to have all injectors tested, they found uneven spray patterns and leakage. The repair was pretty serious since they had to partially disassemble the fuel system to access and replace the faulty injectors. The job took about two days to complete but solved all the issues: smooth running returned, power was restored, and emissions came back to normal. Given your mileage and symptoms, I'd strongly suspect injectors. Make sure to find a shop that specializes in BMW hybrids, it makes a big difference in diagnosis and repair quality.

Thanks so much for sharing your experience! This sounds exactly like what I'm dealing with. Really helpful to know it turned out to be the injectors in your case, makes total sense given all the symptoms. Hey, if you don't mind me asking, do you remember roughly how much you ended up paying for the whole repair? Also, has everything been running smoothly since the fix, or have you noticed any other issues pop up? Really appreciate the help!

Hey again! Happy to help fill you in on the details! After getting it fixed back then, I'm glad to say my ActiveHybrid 5 has been running like a dream. The repair bill came to 515 € for replacing the defective injection valve, and honestly, it was worth every penny. The mixture preparation error that was causing all those headaches is completely gone now. No more jerking, stalling, or power loss issues at all, it's like having a different car! Been about a year since the fix and I haven't had a single problem related to that issue. The engine runs super smooth, emissions are perfect, and the hybrid system is working exactly as it should. Just make sure you find a mechanic who really knows their way around BMW hybrids, that's absolutely crucial. Mine did a thorough job testing all the injectors before zeroing in on the faulty one. Saved me from having to replace parts that were actually working fine. Let me know if you need any other info, always happy to share my experience with fellow BMW hybrid owners!

Thanks for the detailed follow-up! That cost actually seems pretty reasonable considering what I was imagining. Really relieved to hear it's been smooth sailing since your repair. Just got back from a new mechanic today actually. Your input helped me explain the symptoms better, and sure enough, they found two faulty injectors. Getting them replaced tomorrow. The quote was a bit higher than what you paid, but still within my budget. It's been super stressful dealing with this problem, but hearing your success story gives me confidence that I'm on the right track. I'll post an update once everything's fixed up. Thanks again for all your help, this community's been amazing! Keeping my fingers crossed that my BMW runs as well as yours after the repair. Really appreciate you taking the time to share all the details!