BMW 4 Series Multiple System Failures, Help Needed

Hey there! I had a pretty similar issue with my 2019 BMW 3 Series (having some experience working on BMWs). The symptoms you're describing sound exactly like what I dealt with, unusual system failures, nav issues, and those annoying warning lights popping up. I took it to my trusted workshop after trying basic troubleshooting. Turned out it was a faulty cable connection to the main control unit that was causing communication problems with the BUS system. The fix wasn't too complex, but it needed proper diagnostic equipment. Cost me about 155 Euro total, and it's been running perfectly since then. Can you tell me if you've noticed any pattern when these issues occur? Like during cold starts or after driving for a while? Also, which specific warning lights are you getting? This info would help confirm if we're dealing with the same problem.

Thanks for sharing your experience! I'm at 130271 KM and just had my service last month, so it's pretty frustrating to deal with these issues. The warning lights are super unusual, they pop up mostly during longer drives, especially when I've been on the road for about 30 minutes or so. I haven't noticed any specific pattern with cold starts though. The weird thing is, sometimes the system just resets itself after I park for a while. My mechanic mentioned something about the control module but wasn't completely sure. Did your cable issue show any physical signs of damage? I'm hoping it's something similar to what you had, as that seems like a straightforward fix. Definitely beats having to replace the entire control unit!

Hey again! Thanks for those details about your situation. Yeah, I totally get your frustration, I was in the same boat with my BMW. The symptoms you're describing are eerily similar to what I experienced, especially the part about the system resetting itself after parking. In my case, the cable didn't show any obvious physical damage, which made it tricky to diagnose at first. When my mechanic eventually found it, it looked totally fine on the outside, but there was corrosion at one of the connection points that was causing intermittent connectivity issues. That's why the problems would come and go, the connection would work fine until the car warmed up and things started expanding slightly. Based on what you're saying about the timing (30 minutes into drives), I'm even more convinced it could be the same issue. The heat from driving can cause these connection problems to act up. When I first took mine in, they also mentioned the control module as a possible culprit, but thankfully they dug deeper and found the actual cable issue. If I were you, I'd definitely have them check the cables and connections first before replacing any major components. It saved me a bunch of money, and it sounds like we had almost identical symptoms. Keep me posted on what you find out!

Thanks so much for the detailed follow-up! This actually makes a lot of sense, especially what you mentioned about the heat causing connection problems. I just called my mechanic and specifically asked about checking the cables and connection points before jumping into replacing the control module. He agreed it's worth investigating, especially given how similar our issues sound. I really appreciate you taking the time to share your experience, it's given me a much clearer direction to explore. You've probably saved me both time and money here! I'll definitely get it checked out this week and let you know what they find. Fingers crossed it's just those pesky cables and connections like in your case. I'm already feeling more optimistic about getting this sorted without breaking the bank!