The OPAS support and rudder broke off on one of my 2002 gtx 4tech limited and since then my check engine light is flashing. everything ran great before it broke. could that be what's making the check engine light flash.
Thanks for your help Michael. I didn't see any sensors for that system however thought I would ask. I do know about the diagnostic mode.
that is my next step. wish i had checked it when it was having the problem on the water. i will have to run it again and see if i can get a fault code.