How to resolve the P0031 fault code?

1 Answers
DeArcher
07/29/25 9:13pm
You can unplug the sensor connector and measure the resistance between the two wires to see if it falls within the appropriate range. Here is some relevant information: 1. Oxygen sensor poisoning: Oxygen sensor poisoning is a common and difficult-to-prevent fault, especially in cars that frequently use leaded gasoline. Even a new oxygen sensor may only work for a few thousand kilometers. If the lead poisoning is mild, using a tank of unleaded gasoline can remove the lead from the sensor surface and restore normal operation. 2. Causes of failure: The silicon dioxide produced by the combustion of silicon compounds in gasoline and lubricating oil, as well as the organic silicon gas released from improper use of silicone rubber gaskets, can cause the oxygen sensor to fail. Therefore, it is important to use high-quality fuel and lubricating oil.
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