How the 3-way catalytic converter and lambda sensor work？

Emission combustion as an important component for emission control,the catalytic converter is monitored by the onboard diagnostics.

If for example misfiring causes unburned fuel to enter the exhaust gas,this can damage the catalytic converter,likewise the catalytic converters ability to convert.

Pollutants decreases over time we call this catalytic converter aging. There for a second lambda sensor after the catalytic converter also known as.

A monitor probe monitors the condition of the catalytic converter lambda sensors measure the oxygen content in the exhaust gas.

 In this example the monitor probes signal shown in red is noticeably lower than the control sensor signal shown in blew this shows that the pollutants are being converted as oxygen in the exhaust gas is reduced on the way through the catalytic converter this catalytic converter is okay in this example.

The control sensor and monitor probe signals are almost identical this indicates that almost no exhaust gas purification is taking place in the catalytic converter. This catalytic converter is defective as a specialist in emission control motor service.

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