BMW X2 Diesel: Turbo Issues Causing Multiple Problems?

Hey there! I can relate, had a similar nightmare with my 2020 BMW X1 diesel last year. I have some experience working on cars, but this was beyond my DIY skills. My X1 showed exactly the same symptoms as your X2, check engine light, terrible power loss, and that annoying whistling sound. The idle was so rough I thought the engine would die at every stoplight! Fuel consumption went through the roof too. Took it to my trusted workshop, turned out it was indeed the electrical bypass valve acting up. They replaced it and recalibrated the system, cost me around 250 Euro all in. Car's been running like new since then. Before I can give more specific advice, could you share if you're getting any specific error codes? Also, how many miles/kilometers are on your X2? These details would help compare our situations better. Funny enough, my mechanic mentioned this is a somewhat common issue with recent BMW diesel engines, including the X1 and X2 models.

Thanks for sharing your experience! My X2 has only 7115 KM on it and had its latest service just two months ago. I'm getting error code P0299, which points to turbo underboost. Your situation sounds exactly like what I'm experiencing, it's actually reassuring to hear it was a relatively straightforward fix for you! I'll definitely get it checked out at the workshop this week. Hopefully, it's just the bypass valve like in your case. Did your whistling noise also get louder with acceleration?

Yeah, totally! The whistling noise in my X1 definitely got more intense when I accelerated, it was like a high-pitched hiss that got louder the harder I pushed the pedal. That P0299 code is exactly what I got too! Here's something interesting, after they fixed mine, my mechanic explained that the electrical bypass valve can fail even on low-mileage cars like yours. It's not really about wear and tear, sometimes it's just a manufacturing thing. Since your X2 is still pretty new with only 7115 KM, this should definitely be covered under warranty. Just a heads up, while they're fixing it, have them check the surrounding hoses and connections too. In my case, they found a slightly loose clamp that could have caused problems later on. The whole job took them about 2 hours, and I haven't had any issues since. I actually kept driving mine for about a week before getting it fixed (not recommended, by the way), and the symptoms just got worse. The whistling got louder and the power loss became more noticeable. Good call on getting it checked out quickly, you'll be amazed at the difference once it's fixed!

Thanks so much for all that detailed info! You've made me feel much better about getting this sorted. It's weird how these issues can pop up even on newer cars, but I'm relieved it's likely just the bypass valve. I'll definitely make sure they check all the hoses and connections like you mentioned, that's a great tip! I've already booked it in for tomorrow morning actually, and I'll be sure to mention your experience to the mechanic. Really hoping it'll be covered under warranty since the car's so new. I've been babying it since the symptoms started, driving really carefully to avoid making things worse. You know what's funny? Just this morning the whistling got so loud that my partner thought there was a kettle boiling somewhere in the car! Can't wait to get that sorted. Thanks again for sharing your experience, it's exactly what I needed to hear before taking it to the workshop. I'll update the thread once it's fixed in case anyone else runs into the same problem!