X-Type (X400) V6-3.0L (2002)
Oxygen Sensor: Description and Operation
Heated Oxygen Sensor (HO2S)
Heated Oxygen Sensor (HO2S)
The heated oxygen sensor (HO2S) is a linear characteristic type sensor, fitted forward of the exhaust system's catalytic converter. The PCM uses this as
it's primary sensor to measure the oxygen content of the exhaust gasses within the exhaust system to provide closed-loop fuelling control.
Catalyst Monitor Sensor
The catalyst monitor sensor is a non-linear characteristic type sensor fitted to the exhaust system's catalytic converter. The PCM uses this as it's
secondary sensor to measure the oxygen content of the exhaust gasses within the exhaust after they have passed through the catalytic converter. As well
as providing additional closed-loop fuelling control the PCM uses this information to determine the efficiency of the catalytic converter.