An oxygen sensor (or lambda sensor, where lambda refers to air-fuel equivalence ratio, usually denoted by λ) or probe or sond, is an electronic device that measures the proportion of oxygen (O 2) in the gas or liquid being analysed.. It was developed by Robert Bosch GmbH during the late 1960s under the supervision of Günter Bauman. The original sensing element is made with a thimble-shaped.. A sensing element sits inside the sensor, encased in a steel housing. Oxygen molecules from the exhaust gas pass through tiny slots or holes in the sensor’s steel shell to reach the sensing element or nernst cell. On the other side of the nernst cell, oxygen from the air outside the exhaust travels down the O2 sensor and makes contact.
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02 sensors measure the amount of oxygen in the exhaust and report the level to your vehicle’s computer. There are O2 sensors before and after the catalytic converter. The upstream O2 sensor controls how much fuel is added to the air/fuel mixture. The downstream O2 sensor makes sure the catalytic converter is working.. An oxygen sensor (aka O2 sensor or lambda sensor) is designed to detect the amount of oxygen in the exhaust. It does this up to 7 times per second. It compares the amount of oxygen in the exhaust fumes to the amount of oxygen outside the vehicle. The O2 sensor then sends the data to the ECU which adjusts the air/fuel mixture accordingly.
