2006 S40 2.4i Owner's Manual

Go to a Volvo dealer that sells lots of used cars. Ask the parts department people - if you but a new key will they throw in a manual from the used car lot. Most places have extras.

Failing that, many locksmith shops can now make chip keys with programming. Manuals on e-bay?

Solution

I just received this link from Volvo Customer Care:
Volvo Cars | Your Volvo
You can download the owner's manual amongst other things for pretty much any Volvo.

Thanks!

I think you can buy them from volvotechinfo.com or just use the link Volvo S40 and V40 Free Workshop and Repair Manuals