1999 "EE" Evinrude 70HP 4-Stroke Service Repair Manual, P/N 787023, Page 55Get this manual

1999 "EE" Evinrude 70HP 4-Stroke Service Repair Manual, P/N 787023, Page 55

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02 Sensor (Optional) This device is not standard equipmentIt's used as service tool to recalibrate the ECU to compensate for normal engine wearIt detects the concentration of oxygen in the exhaust gas