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Monthly Archives: March 2021

Oxygen Sensor

Oxygen Sensor

Oxygen Sensor Many people hear the term “oxygen sensor" and figure it must have something to do with sensing oxygen. But they don’t really know much beyond that. Let’s break it down; your vehicle has an oxygen sensor in the exhaust manifold that measures how much un-burned oxygen there is in the exhaust. The sensor reports its findings to the engine control unit (ECU), which knows how much oxygen there should be in the exhaust. Based on that information, the ECU will adjust the amount of fuel it sends to the engine. This feedback and adjustment loop is non-stop. The goal is to have the optimal air to fuel ratio for performance, efficiency and to lower harmful emissions. Now there is a second oxygen sensor located in the exhaust pipe after the catalytic converter. It also measures the amount of oxygen in the exhaust after it has been treated by the catalytic converter. As this measurement is reported back to the ECU, the computer compares the o ... read more

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