I had the problem with our S 60 not starting if it was colder than 32°. It would crank and crank and occasionally the rpm needle would jump up but come right back down. As soon as it got warmer it will start right up. Did some research and saw other people had issues with the crank shaft sensor so I replaced that. About $70 part. Very easy to swap it out and it solved the problem But I created another one in the process. When I went to tighten the 10 mm bolt I tightened it too tight and the bracket that holds the sensor snapped. It’s a plastic bracket against a very hot engine so it gets very brittle. Be very careful when cranking down on that 10 mm bolt because getting that bracket out was a two hour job and the worst replacement I’ve ever had to do. It’s a Stupid design. Just get it to be snug and don’t force it or you will hate yourself. 😃