BMW XM Engine Issues, DISA Valve Problems and Fixes?

Hey there! I have some experience working on BMWs. Actually, I had a similar issue with my 2020 BMW X6 last year. The symptoms were exactly like yours, rough idle, drop in power, and that annoying check engine light. Turned out it was indeed the DISA valve. Took it to my regular workshop and they confirmed the diagnosis, the complete DISA unit was faulty. The repair cost me around 280 Euro, but it was worth it. The car runs smooth as butter now. Before I share more details about my repair experience, could you share: What's your current mileage? Are you getting any specific error codes? Does the issue get worse when the engine is cold or warm? By the way, if you're planning to get it fixed, don't wait too long. When I delayed fixing my X6, it started affecting the engine's overall performance. Noticed quite a difference once it was repaired.

Thanks for sharing your experience! My XM has only done 6826 KM and had its last service recently. You're spot on about not waiting, I've noticed the performance issues are getting more noticeable. Haven't pulled the error codes yet, but the symptoms are definitely worse when the engine's cold, especially in the morning. Kind of frustrating dealing with this on such a new car, but good to hear your repair sorted things out. Might have to bite the bullet and get it checked at the workshop soon.

Yeah, with just 6826 KM, that's definitely not normal! When I had my X6 fixed, it was showing similar symptoms especially during cold starts. The morning starts were the worst, felt like the car was going to stall every time. Based on what you're describing, it really does sound like the same DISA valve issue I had. The cold start symptoms are particularly telling, that's exactly how mine acted up. Since your car is so new, you should definitely get it checked under warranty. I had to pay for mine since my car was out of warranty, but you shouldn't have to. Just a heads up though, when I took mine in, they initially tried suggesting it might be something else. Stick to your guns about getting the DISA valve checked first. My mechanic eventually found that the valve actuator was sticking, causing all those symptoms we discussed. Quick tip that helped me before I got it fixed, try to let the engine warm up for a minute or two before driving off. It won't solve the problem, but it helped minimize the rough running in my case. Let us know what you find out when you get it checked!

Thanks so much for all the detailed advice! Really appreciate you sharing those specifics about your X6 experience. Good to know about letting the engine warm up, I'll definitely try that tip while I wait to get it checked. And thanks for the heads up about them potentially suggesting other issues. I'll make sure they thoroughly check the DISA valve first. You're right about the warranty, just called the dealership and they confirmed it should be covered. Got an appointment booked for next week. Feels better knowing someone else dealt with the same problem and got it sorted. I'll definitely update the thread once I know what they find. Really hoping it's a straightforward fix like yours was!