How do you find a code when your warning light goes off. I have two F12's and both run great but the warning light and buzzer go off on WOT. I recently changed oil and I am concerned that I might have too much oil. Will that cause this problem. Water stream is good on shore in test mode and in the lake. Does not seem to be an overheating issue. Buzzer and light go off at idle and staying under 6mph. Any advice would be appreciated.

Jerry