BMW iX Won't Start: Key Symbol Mystery Frustrates Owner

Had a similar issue with my 2018 BMW i4 eDrive40 last month. Started with the key symbol warning, then complete no-start situation. Turned out the affected control unit was malfunctioning, which prevented the car from recognizing the key signal properly. It wasn't just the Hall sensor in my case. Had it checked at a certified service center. The technician had to reprogram the control unit and replace some components of the key authentication system. It was a serious issue since the car was completely immobilized. The repair took about two days to complete since they had to order specific parts. Best approach is to get it properly diagnosed with computer testing equipment, since these electrical gremlins can be tricky to pinpoint. Don't try any DIY fixes, these systems are too complex and interconnected. Make sure they document everything and provide detailed diagnostics before starting any work.

Hi there, so sorry to hear about your issue. I actually went through something very similar with my iX a few months back. Your symptoms sound exactly like what I experienced. After getting mine fixed, everything's been working perfectly, no complaints at all. Just curious, do you remember how much the repair ended up costing you? And has everything been running smoothly since then? Always good to know if any other issues popped up later.

Hey there! Thanks for asking about the follow-up. Yeah, since getting it fixed, my i4 has been running like a dream, no more issues with the key or starting system at all. The total bill came to 1000 € for the control unit repair, which included sorting out that pesky Hall sensor in the key. I know it sounds steep, but at least it solved the problem completely. I've put about 5,000 km on it since the repair, and honestly, it's been perfect, starts every time, no warning lights, nothing. The mechanic really knew what they were doing with these electrical systems. Was definitely worth getting it properly diagnosed and fixed rather than trying any shortcuts. Glad to hear your iX is also running well after the fix! These high-tech cars can be a bit finicky sometimes, but once you get these kinds of issues sorted out properly, they're fantastic to drive.

Thanks for sharing those details! Yeah, I finally took mine to a certified mechanic last week. Similar to your experience, my repair involved the control unit, but they also found some connection issues with the key authentication system. The bill was actually pretty close to what you paid, around 950 plus tax. The mechanic was super thorough and walked me through everything they were doing. Got it back after three days, and I've gotta say, it's been running perfectly since then. No more key symbols, starts right up every time. Really relieved it wasn't something more serious. It's funny how these fancy tech features are great until they act up, but I guess that's just part of owning a modern car. Anyway, thanks again for your help, definitely made me feel better knowing I wasn't the only one dealing with this kind of issue!