S60 Camshaft Sensor Failure

Sounds familiar. I've seen similar behavior on my S60. Is it throwing any camshaft position error codes? Could be the encoder wheel on the camshafts themselves.

Thanks. How likely is the encoder wheel defective if I haven't checked the ignition timing yet?

If the ignition timing hasn't been checked, it's harder to say, but with those symptoms, I'd strongly suspect an encoder wheel issue. Might be worth getting it checked by a workshop.

Just got back from the workshop. You were right, the camshaft sensor was defective, and the encoder wheel needed replacement. Total cost was 695€. Thanks for the help!