[Tony1]

First thing..
The steering returning to the centre in a car has noting to do with the mechanics of the steering system - it is the result of physics. The castor angle of the wheels results in the steering always trying to return to straight as that offers the least friction (that is why the wheel doesn't centre when stationary)

So, I would first wonder have you hit any pot holes that may have affected the steering geometry?

Second...
The V40 has electric power steering, have you checked the following?
Power steering reservoir for fluid
Fuses to confirm the power steering pump is getting power
Fault codes

The fault codes might also reveal the steering lock not releasing properly the first time you turn the ignition on.

 

[Tony1]

For a super moderator to get that wrong this forum looks a worry!

Do you want to do it?
I'm here to protect you all from spam accounts, false adverts, phishing attempts etc. not to be the be all and end all of every system fitted to a V40.

I can't believe you joined the forum at about 3am just to point out my mistake!