Re: 02 Merc 40 2 stroke warning buzzer
I have the same motor with oil injection and had the same problem. It's the low oil sensor in the bottom of the oil reservoir. You can check this out by tracing the wires from the bottom of the tank to a connector and unplugging it. IF the buzzer stays silent , the sensor is the problem. IF not, it's probably the sensor that's on the side of the engine which is much harder to replace and more expensive. You can use the motor, just make sure the oil tank has plenty of oil and monitor the sight tube frequently while underway. The mechanic that services mine says it's easier to replace the tank/sensor assembly, but I'm going to try to just replace the sensor (& hopefully less expensive).
Tight Lines
