BMW Tire Sensor Headache: Warning Overload at 171K km

I had a similar issue with my 2019 BMW 7 Series diesel. The tire pressure monitoring system was acting up, showing unusual warnings despite proper tire pressure. Had it checked at the garage, turned out the TPMS sensors' batteries were dying. These sensors are built into the tire valve stems and have a limited lifespan. My experience was pretty straightforward, they needed to replace all four TPMS sensors because when one starts failing, the others usually follow soon. It's not a major mechanical issue, but it needs fixing because the system is part of the car's safety features. The error codes kept coming back until I had them replaced. The speedometer issues you're mentioning could be related since it's all part of the same monitoring system. Would definitely suggest getting a different mechanic to check it out. Just make sure they're using proper diagnostic tools for BMW systems. It's better to address it soon, driving with malfunctioning sensors means you won't get accurate tire pressure warnings when you actually need them.

Thanks for sharing your experience! That's really helpful to know about the TPMS sensors. I'm actually dealing with almost the exact same symptoms. Do you remember roughly how much you ended up paying for the sensor replacements? Also, have you had any other sensor-related issues pop up since getting them fixed?

Hey again! Just wanted to follow up about the cost, I actually just had mine fixed last week. It turned out to be exactly what I thought, the sensor battery was dead. Cost me 280 € to get it sorted, which wasn't as bad as I expected. Since the repair, my tire pressure warnings have completely stopped, and the whole system's working perfectly now. Honestly, it's such a relief not having those annoying warnings popping up anymore! And to answer your question about other sensor issues, nope, haven't had any problems since the fix. The new sensor's been working like a charm. If you're seeing the same symptoms I did, it's probably the same issue. My advice would be to get it checked sooner rather than later, it's definitely worth the peace of mind. Just make sure whoever works on it knows their way around BMW systems. The right diagnostic tools make all the difference. Let me know how it goes if you get it fixed!

Thanks a lot for the detailed info! I actually went ahead and got it checked at a different mechanic yesterday. Just like you said, it was the TPMS sensors going bad. The funny thing is, when I got there, the mechanic knew exactly what was wrong before even hooking up the diagnostic tool, apparently it's super common in these models! Ended up paying about the same as you did for the replacement. They had the parts in stock, so it was a quick fix. The mechanic was great, showed me the old sensors and explained how they work. No more annoying warning lights on my dash now! Really glad I didn't go back to my old mechanic who kept giving me the runaround. Since the fix, everything's working perfectly. The speedometer's back to normal, and those persistent error messages are gone. Such a relief! Really appreciate you sharing your experience, it gave me the confidence to get it sorted properly.