The other day I went through a big puddle & I got the ABS & brake lights and the dreaded flashing arrow on my 2k S70. It got stuck in W mode but just for a short time. The flashing arrow stayed on but I got it cleared & there were several other codes (?). The mechanic said it could have just gotten real wet and confused the computer - thus activating the arrow. OK for a few days then the ABS & brake lights were going in & out along w/ the steady flashing arrow. Now it's stuck in W mode. The car has 141K on it. Does the PNP switch commonly go at about this time and what might be a reasonable price to have it replaced if that's what it is? Thanks.