Oxygen Sensors

Flawless pollution control

To ensure the reduction of harmful emissions produced by the internal combustion engine, the lambda or oxygen sensor has become an important piece of technology. As the leading supplier of oxygen sensors both for OEMs and the Aftermarket, NGK is continually improving its oxygen sensors to make engines cleaner and more efficient.

Fit, click and start: 986 part numbers from OE to IAM

76% coverage of European vehicles in operation (source: TecDoc)

Most complete set of regulating and diagnostic sensors in the market

6 universal part numbers covering 58 million cars

Partner for Clean Air

Maintains a perfect air-fuel ratio
Ensures optimum working conditions for the catalytic converter
Reduces harmful emissions

Oxygen Sensor Technologies

With its NTK oxygen sensors launched in the 1980s, NGK was among the pioneers in this field. Since then, the reduction of harmful emissions has made significant advances, not least thanks to the development of innovative technologies and extensive research.

Today, highly efficient ceramic heaters in lambda sensors ensure, for example, that the sensors start measuring sooner and respond faster. To achieve more accurate measurements in order to meet the ever more stringent Euro standards, huge efforts are being made in the continuous improvement of the ceramic components. In addition, a variety of sensor types have been developed catering to specific applications. They include broadband sensors and lambda sensors whose electric resistance changes depending on the air-fuel ratio.

Oxygen Sensor Requirements

As 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.