S40 Camshaft Sensor Connection Issue

I had a similar problem with my S40, although I can't remember which year it is. Camshaft sensor issues can be a pain. Have you checked the crankshaft sensor as well? Sometimes a faulty crankshaft sensor can throw off the readings and cause similar symptoms, triggering a camshaft sensor error. It might be worth a look before you go replacing the camshaft sensor itself.

Thanks for the quick response! I haven't checked the crankshaft sensor yet. Is it difficult to get to on the S40? And would a faulty crankshaft sensor definitely throw a code, or could it be subtly off and mess things up without triggering a specific error?

It's located near the bottom of the engine, close to the flywheel. Access can be a little tight, but it's manageable with the right tools. As for error codes, sometimes it throws one, sometimes it doesn't. If you're seeing a camshaft sensor error and the wiring looks suspect, I'd start there. But if you're not comfortable digging in, honestly, it might be worth taking it to a workshop. They can diagnose it properly and save you the headache.

Took your advice and brought it to the shop. Turns out it was indeed the camshaft sensor connection, just like I suspected! They cleaned everything up and secured the connection properly. Cost me 95€, but now it runs like a champ again. Thanks for the help!