Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos.
Probably the rear cam seal. It is not easy to get at, but if you can get the cam position sensor cover off, you will be able to tell right away. If you see oil from there, that is for sure your problem.