That just doesn't sound right, How could circuit 6 be faulty on a five cylinder engine?
If it was mine I would have the car trailered to a mechanic who can properly read the codes with VIDA; or a mobile mechanic who could come to you. At least you would have a known starting point instead of taking someone else's dubious diagnosis as fact.
Edit: This may help.
https://www.matthewsvolvosite.com/fo...oogle_vignette