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NGK NTK OZA851-EE37 / 96908 Oxygen Probe Zirconia 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.Zirconium dioxide lambda sensor This oxygen sensor is comprised of a zirconium-dioxide-based solid electrolyte. The output signal is generated by oxygen ions, which pass through the element. The zirconium dioxide lambda sensor is distinguished by the following characteristics: Fast operational readiness Temperature resistance High level of reliability These sensors are used as a regulating and as a diagnostic sensor, depending on the vehicle.