Oxygen Sensors

What is an Oxygen Sensor?

An Oxygen Sensor is a device fitted to cars, light commercials and even some motorcycles and marine applications that are equipped with a petrol engine.  The primary function of an oxygen sensor is to continually detect and measure the oxygen content in the exhaust gases of an engine. The sensor sends this information to the vehicle’s Electronic Control Unit (ECU) in order to detect whether the AFR (Air/Fuel Ratio) is lean (not enough fuel) or rich (too much fuel). Based on this, the ECU adjusts the amount of fuel injected into the engine to achieve an optimal AFR, while at the same time producing as few emissions as possible.