First, use the computer to read the fault code, P0135 before the oxygen sensor heating failure. I believe everyone has a basic understanding of the role of the oxygen sensor, in order to thoroughly understand the role of the oxygen sensor, you need to understand the following knowledge points.
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Front oxygen sensor: monitor the oxygen content in the exhaust gas of the engine, feedback the analog voltage signal, and transfer it to the ECU computer through the digital signal amplifier, and the computer corrects the fuel injection amount, so that the engine can work close to the theoretical air-fuel ratio, and the working mode is closed-loop.
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Closed loop mode: The closed loop is that the engine works in accordance with the theoretical air-fuel ratio. However, the working combustion charge is not sufficient, it is necessary to feedback the signal through the oxygen sensor, the engine makes the injection amount correction, and then the oxygen sensor continues to feedback, the engine continues to correct, so the cycle of work.
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Post-oxygen sensor: Post-oxygen sensor: mainly to monitor whether the three-way catalytic converter is damaged. The post-oxygen feeds back the oxygen content after the ternary catalytic conversion to the ECU, and the ECU computer compares the data with the pre-oxygen, and the signal of the pre-oxygen is normally higher than that of the post-oxygen. If the same proves the failure of the three-way catalytic converter, the post-oxygen is mainly for environmental monitoring.
Treatment method of engine failure light is always on:
1, the engine failure caused by the oxygen sensor is bright: check whether the oxygen sensor plug is loose before and after, oxide blockage caused by the oxygen sensor can be cleaned with carburetor cleaning agent or sulfuric acid diluted ferric chloride solution cleaning, the damaged oxygen sensor can be replaced.
2, oil caused engine failure light: you can go to the 4s store to use special tools to pull out the gasoline in the tank and replace it with high-quality gasoline.