PS2 game plays in black&white

[Toaster]

my m8 gave me a ps2 game - ridge racer 5 that he downloaded from the net. While some games play in colour. ridge racer 5 played in black and white. Why is this and what can I do to patch it to colour. I am using neo2/AR2V1.3 on pal ps2, with scart lead.
I'm thinking it is ntsc format, do I need a link wire in ps2 wiring or can it be done with a patch of some kind.
I eagerly await your comments