Q50 Diesel Power Loss: Boost Control Problems?

Hi there! I have some experience with cars and had a similar issue with my 2016 Infiniti Q60 diesel last year. The symptoms you're describing sound exactly like what I went through sluggish acceleration, check engine light, and that annoying jerking sensation. Took it to my trusted workshop, and it turned out to be the wastegate valve linkage that needed adjustment. Cost me about 240 Euro to fix, but the car's been running smoothly since then. The mechanics adjusted the linkage that controls boost pressure, and it made a world of difference. Could you share your car's mileage and whether you've noticed any turbo-related noises? This info would help confirm if we're dealing with the same issue. Also, when did these symptoms first appear?

Thanks for your detailed response! Yeah, I'm sitting at 103502 KM and just had my service done last month. I haven't noticed any unusual turbo noises, but the symptoms started about a week ago, getting progressively worse. Good to know about the wastegate valve linkage that's super helpful and definitely sounds similar to what I'm experiencing. I'll get it checked out. Thanks for sharing your experience!

Hey again! Thanks for the update about your mileage and symptoms. You know what's interesting? My Q60 had almost the same mileage (around 105K) when I ran into these issues. The fact that your symptoms are getting worse progressively is exactly what happened with mine too. Just to add to my previous response after the wastegate linkage fix, I also had them do a thorough check of the turbo system just to be safe. It's worth mentioning that in my case, the problem started showing up more when the engine was warm, especially during highway driving. Was that the same for you? Since you mentioned you just had service done last month, maybe check with your service center if they noticed anything unusual during the service? Sometimes these issues can start showing up shortly after routine maintenance if something wasn't adjusted quite right. Still happy with how my fix turned out haven't had any issues since then. Just make sure you get it checked soon though, as driving with these symptoms for too long isn't great for the turbo system. Let me know how it goes when you get it looked at!

Thanks so much for the follow-up! Actually, yes I've noticed it's definitely worse when the engine's warm, especially on the highway. That's really interesting about the similar mileage too. You've given me more confidence about what might be wrong. I'll definitely call my service center tomorrow to check if they spotted anything during the last service. I've actually got their number right here, and I'll mention the wastegate linkage issue specifically. Really appreciate you taking the time to share all these details it's super helpful knowing someone else dealt with the same thing and got it sorted. I'll update the thread once I get it fixed! Thanks again for all your help!