Oxygen Sensor ED8A-9F472-Ca,NQ-E158,ED8A9F472Ca,NQE158 for FORD

Oxygen sensor failure determination
When the oxygen sensor is working, the voltage fluctuates around 0.5V, the fluctuation range is between 0.1~1V, and the voltage jump frequency is about 8-10 times every 10 seconds. Based on this, the working status of the oxygen sensor can be determined.
Front oxygen sensor rear oxygen sensor
The oxygen sensor in front of the three-way catalytic converter is called the front oxygen, and the rear oxygen is mounted after the three-way catalytic converter. It is generally considering that the front oxygen has a greater effect than the rear oxygen, because the front oxygen is used to adjust the density of the mixed gas, and the rear oxygen is to monitor the working condition of the three-way catalytic converter. Oxidation reaction will occur when the three-way catalytic converter is working, such as CO+02=CO2, which means that the oxygen content monitored by the rear oxygen is less than that of the front oxygen.  Otherwise, the three-way fails or the purification capacity decreases, a few vehicles will light up the fault light, prompting the owner to check or replace the catalyst.