BMW iX2 Key Fob Issue: Hall Sensor Mystery Explained

I had a similar issue with my 2021 BMW i4 last month. After scanning, it showed the same key symbol and error codes related to the control unit. Initially thought it was just the key fob battery, but the dealership confirmed it was more serious, a defective control unit that manages the key recognition system. They had to replace the entire control module and reprogram it to sync with my keys. It wasn't a quick fix, took them about two days to get the parts and complete the work. From my experience, this isn't something you want a general mechanic to handle, as it requires specific BMW diagnostic tools and coding expertise. The control unit issue can cause complete vehicle immobilization, so it's best to get it checked ASAP at a certified dealership. While they fixed mine, they also mentioned these issues are becoming more common in newer electric BMWs due to their complex electronic systems. Hope this helps with your decision. Good luck getting it sorted.

Hey, thanks for sharing your experience with the control unit issue! This actually sounds exactly like what I'm dealing with. Glad to hear theyaged to fix it for you. I'm curious though, do you remember roughly how much you ended up paying for the whole repair? Also, has everything been running smoothly since they fixed it, or have you noticed any other quirks?

Hey there! Happy to give you an update. Yes, everything has been running perfectly smooth since I got it fixed, not a single problem with the key recognition system. The repair cost me exactly 1000 € to fix the faulty control unit, which included parts, labor, and reprogramming. Money well spent though, because the issue was definitely the Hall sensor in the ignition key that was causing all the trouble. It's such a relief to have it sorted properly. I just jump in and drive now without any of those annoying key symbols popping up on the dash. My advice was spot on about going to a certified place, they knew exactly what they were dealing with and had all the right diagnostic tools to fix it properly. I know these kinds of repairs can be pricey, but when it comes to the complex electronics in these new electric BMWs, it's worth getting it done right. Let me know if you need any other details about the repair, happy to share more about my experience!

Thanks so much for all that detailed info! I actually just got back from getting my car fixed and wanted to update you. Turned out my issue was slightly different, it was a corrupted software in the key recognition module rather than the Hall sensor I initially suspected. The certified mechanic I found was fantastic, really knew his stuff with these electric BMWs. The whole thing cost me around 800 € and took about a day and a half to fix. They had to do a complete system reset and reprogram the module. Honestly, I'm just relieved it's sorted now. The car starts perfectly, no more annoying key symbols, and everything's working like new again. Really appreciate your help in pointing me in the right direction about going to a certified place. You were absolutely right, these new electric systems need specialists who know what they're doing. Thanks again for sharing your experience, it really helped me make the right decision!