Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 202Get this manual

Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 202

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Problem: Warning Horn Stays on When Ignition Key is Turned to "ON" PositionPossible Cause Engine overheat sensor

Corrective Action
Disconnect both low oil sensor leads from terminal