Thank you for contributing. I reached out to the local dealer, and they mentioned that the valve is motor-driven and can fail. Sounds like you were correct! I'll keep an eye on it to see if continues.Mine has been making a similar sound recently! I’m 95% sure it’s the butterfly valve in the passenger side exhaust outlet in my case. I found a DTC code I think might be related (no lights or warnings in the dash) but haven’t confirmed.
Do you have a T6? You can see the valve if you shine a light in the passenger side exhaust.
2019 S60 T6 Inscription w/advanced & Polestar tune