Volvo S40 starting problem

The symptoms you describe mirror an issue I had with my Opel Astra. It turned out to be the crankshaft position sensor. Have you checked that as well?

Thank you for your suggestion. I will investigate this. If it was the crankshaft sensor on your Opel, what were the specific fault codes?

I cannot recall the exact fault codes. Given the stalling and ignition timing issues, coupled with the check engine light, it is likely the encoder wheel on the camshafts is defective. I recommend a visit to a reputable workshop.

Thank you for the advice. After taking it to the workshop, it was indeed the camshaft sensor. The final repair bill was 695€. The garage confirmed the encoder wheel on camshafts was faulty.