BMW X2 Boost Drop: Charge Air Temp Sensor Warning Signs

I had a similar issue with my BMW X1 2018 last month. The symptoms were exactly what you're describing, power loss, that distinctive whistle noise, and the check engine light. After diagnosis, it turned out the charge air temp sensor connector was loose and had some corrosion. The wiring harness also showed signs of wear. Fixed it by replacing the connector assembly and cleaning the sensor housing. It wasn't a major repair, took about an hour at the shop. My car had around 98k km when this happened. While it's not a severe mechanical issue, it's definitely something you want to address soon since it affects engine performance and could potentially cause more problems if left unchecked. If you're getting similar symptoms, I'd suggest having it checked by a reputable BMW specialist. Sounds exactly like what I experienced, and it's likely the same connector/sensor problem rather than something more serious with the turbo system.

Thanks for sharing your experience! That's really helpful since it matches my symptoms exactly. Good to know it wasn't anything too major with yours. Do you remember roughly how much you ended up paying for the fix? Also, has everything been running smoothly since the repair, or have you noticed any other quirks?

Hey there! Happy to give you an update. Just got my car back from the mechanic last week, and yes, it was exactly that charge air temperature sensor issue we discussed. They found a faulty cable connection to the sensor, got it fixed for 95 €. Pretty reasonable, I'd say, especially considering how much I was worrying it might cost! The car's running like a charm now. That annoying whistle is completely gone, and the power delivery is back to normal, feels like a totally different car! No more check engine light either, which is a relief. I've put about 500 km on it since the repair, and everything's working perfectly. No other quirks or issues to report. Honestly, looking back, I was probably making it a bigger deal in my head than it needed to be. These sensor issues can be scary when they first pop up, but sometimes it's just a simple fix like in our cases. Hope you get yours sorted just as easily!

Thanks for the follow-up! I actually just got mine fixed too and wanted to share my experience. Took it to a certified mechanic who diagnosed it right away. Turned out the sensor and wiring needed replacing, bit pricier than yours at 175 €, but worth every penny. The funny part was watching the mechanic's reaction when he heard the whistling noise, he knew exactly what it was before even hooking up the diagnostic tool! He had it fixed in about two hours, and what a difference. The car feels brand new again, no more power drops or weird noises. Really glad I didn't put it off any longer. He mentioned these issues can get worse if ignored, so I'm happy I took care of it quickly. Thanks again for helping me avoid another sketchy repair experience, definitely feeling more confident about the whole situation now!