Kadjar boost pressure fault

Greetings. I recall encountering a comparable predicament with my Kadjar. If I may inquire, have you discerned any occurrences of turbo lag or compressor surge concomitant with the diminution of engine power? Furthermore, a diagnostic assessment of the boost solenoid and bypass valve functionality could prove enlightening in ascertaining the underlying etiology of the pressure drop.

Thanks for the quick reply! I haven't specifically checked for turbo lag or compressor surge, but the sluggishness definitely feels like it could be related. Can you elaborate on the boost solenoid and bypass valve checks? Is there a specific procedure I should follow?

Affirmative. The concurrence of symptoms you delineate strongly suggests a potential compromise in the vacuum switching valve's operational integrity, a common cause for boost pressure irregularities. While a detailed diagnostic protocol is beyond the scope of this discussion, I would advise consulting a qualified automotive technician for a comprehensive evaluation. It may be judicious to consider professional intervention to preclude potential exacerbation of the issue. For me it was a defect in a vacuum switching valve.

Thanks a lot for your help! I took it to the workshop. You were right, it was indeed the vacuum switching valve. Repair cost was about 140€. Everything is back to normal now.