Quicksilver Mercruiser Oxygen Sensor 8M2003959

Quicksilver Mercruiser Oxygen Sensor 8M2003959

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The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust as the exhaust exits the engine. Monitoring oxygen levels in the exhaust is a way of gauging the fuel mixture. It tells the computer if the fuel mixture is burning rich (less oxygen) or lean (more oxygen).

Mfg. # 8M2003959

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