XC60 Engine Jerking Whistling

Whoa, that sounds rough! I had something similar happen in my XC60 (not sure if the same year), and it drove me nuts. That whistling and hissing sounds like it could be related to the turbo system. Have you checked the air intake or any of the hoses connected to the turbocharger? It might be something simple like a cracked hose or a loose connection on the intake manifold.

Thanks for the quick reply! I haven't really poked around too much under the hood, to be honest. I'm not super mechanically inclined. When you say 'air intake' and 'hoses,' are those easy to spot? And would a loose connection really cause all those problems?

Yeah, the air intake is usually a big plastic tube going into the engine, and you should see some smaller hoses branching off of it. A loose connection or a crack, even a small one, can mess with the boost pressure and cause all sorts of mayhem, especially with the turbo. It's worth a look, but honestly, with all those symptoms, especially the stalling, you might be better off taking it to a workshop. A bad boost pressure sensor can cause a lot of headaches and could be related to defective cable or plug connection of the component. In the end it just cost me 95€ to fix.

Thanks so much for the advice! I think you're right, it's probably beyond my limited skills. I'll take it to a shop and mention the boost pressure sensor and the hoses. Hopefully, it's something simple and not too expensive. I really appreciate the help!