Berlingo boost pressure control fault

I had a similar issue with my Berlingo, though I can't remember the exact year. Check for the boost solenoid valve, also known as a vacuum switching valve. It's part of the turbo system. Is it only doing it when the engine is hot? Does it happen more often uphill?

Cheers for the tip! Where exactly is that valve located? And yeah, it seems worse when the engine's been running a while, and hills are a killer. Is it easy to get to, or am I looking at a proper garage job?

OK, sounds very similar to what I had. You'll find the valve near the intake manifold, somewhere around the turbo. Honestly, unless you're confident fiddling with the turbo system, I'd suggest taking it to a workshop. I messed around with mine for ages and ended up making it worse. In the end I had to take it in anyway. So yeah, workshop is the way to go!

Thanks a million! Took your advice and got it to a garage. Turns out you were spot on – the vacuum switching valve was kaput! New one fitted, cost me 140€ all in, and she's running like a dream again. Massive relief!