BMW M2 Coolant Warning Signals: Real Owner's Alert

I had a similar issue with my BMW M4 2020 last month. The coolant temp warning and check engine light combo turned out to be a faulty coolant temperature sensor and a loose connector. The sensor wasn't sending correct readings to the ECU. Got it fixed at a certified BMW service center. They diagnosed it with proper scanning tools and found that the wiring harness connecting to the temp sensor was damaged, causing intermittent connection issues. They replaced both the sensor and the damaged wiring section. This wasn't a major repair, but ignoring it could've led to the engine running too hot without proper warning. The whole thing took about 3 hours to fix. Definitely recommend getting it checked at a certified BMW shop, they'll have the right diagnostic equipment for these newer models. Since you're still under warranty with that 2023, I'd take it straight to the dealer. No point risking your warranty coverage by going elsewhere.

Thanks for sharing your experience! That's really helpful info about the sensor and wiring. Would you mind telling me 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? I'm leaning towards taking mine to the dealer as you suggested, but just trying to get an idea of what I might be looking at cost-wise if it turns out to be something similar to what you experienced. Really appreciate the advice!

Hey there! Happy to help with the cost info. I actually just got this fixed a couple weeks ago, and it ended up being way simpler (and cheaper) than I expected, just €95 to sort out a wonky cable connection. The mechanic also topped up the low coolant level while they were at it. Since the repair, my M4's been running like a dream, no more warning lights, no weird temperature readings, nothing. It's such a relief when these things turn out to be straightforward fixes! It's actually kinda funny how something as simple as a loose connection can trigger all those scary warning lights. Mind you, my repair bill might be different from what you'll end up paying, these things can vary. But yeah, definitely stick with your plan to hit up the dealer, especially since your M2's still under warranty. Better safe than sorry with these high-performance cars, right? Let me know how it goes!

Just got back from getting my M2 checked out at the dealer. You were spot on, it turned out to be a minor issue! The main problem was a cracked coolant reservoir that was causing the system to lose pressure. They also found a loose sensor connection while they were in there. Since my car's under warranty, I didn't have to pay anything for the repairs. The service advisor mentioned that these issues sometimes pop up in new cars during the break-in period. They kept my car for about four hours, gave it a full inspection while they were at it, and even washed it before returning it. Everything's running perfectly now, no more warning lights or error codes. Really glad I followed your advice about going to the dealer. They even gave me a detailed report showing exactly what they found and fixed. Thanks again for sharing your experience, it helped me avoid another potential nightmare with a sketchy mechanic!