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NGK NTK UAA0004-FA016 / 91956 Oxygen Probe Lambda SensorAs proper conversion of undesirable gases can only occur at a set air-fuel ratio, an oxygen sensor has the task of precisely measuring the ratio present in exhaust gases and to inform the vehicle's ECU (Electronic Control Unit) in order to adjust the air-fuel ratio. This entire process not only helps effectively reduce harmful emissions, but also optimizes fuel consumption and ensures a long service life of the catalytic converter. Modern cars are normally equipped with at least two lambda sensors, namely a front or regulating sensor installed in front of the catalytic converter and a rear or diagnostic sensor mounted after the catalytic converter.Broadband lambda sensors are capable of issuing a signal proportional to the residual oxygen content of the exhaust air. These sensors are used as regulating and diagnostic sensors for petrol and diesel engines. Sturdy and compact design Short response time No reference air required Operating temperature reached quickly