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Lambda sensors (otherwise known as oxygen sensors) are a vital component in modern electronic fuel injection systems. The purpose of the sensor is to measure the amount of oxygen in the exhaust gases spent from the combustion chamber.  This is equated to the air-to-fuel ratio that entered the combustion chamber using the stoichiometric equation for the fuel being used. The lambda sensor outputs a value of 1.0 when stoichiometry has been achi …