Mini Paceman boost pressure control fault

Sounds like a familiar headache. I had similar issues with my Mini Paceman a while back. Check engine light, noticeable power loss, the whole shebang. Have you looked at the bypass valve? A faulty boost controller can also cause similar symptoms.

Bypass valve, you say? I've been reading about those. Where exactly is it located, and is there a way to test it without specialized equipment? Also, could a vacuum leak cause a pressure drop severe enough to trigger these symptoms?

Yeah, definitely sounds like the same issue I had. The bypass valve is usually near the turbo. Honestly, without proper tools, testing it yourself is tricky. A vacuum leak could definitely cause a pressure drop, and limp mode. Save yourself the stress and take it to a workshop. They'll diagnose it properly.

Thanks a bunch for the insight. Turns out it was indeed a faulty vacuum switching valve. Got it replaced for 140€ and the Paceman is back to its old self. No more check engine light or limp mode!