Oxygen sensor common faults
1, oxygen sensor poisoning
Oxygen sensor poisoning is often a difficult and difficult to control a failure, especially in the often use of leaded gasoline cars, even the new oxygen sensor, can only work thousands of kilometers. If only a slight lead poisoning, then use a box of lead-free gasoline, you can eliminate the oxygen sensor surface lead, to return to normal work. But often due to the high exhaust temperature, leaving the lead into its internal, hinder the proliferation of oxygen ions, so that the oxygen sensor failure, then only replacement.
In addition, oxygen sensor silicon poisoning is also common. In general, the silicon dioxide and silicone rubber gaskets produced by the combustion of silicon compounds contained in gasoline and lubricants use improperly emitting silicone gases that will render the oxygen sensor ineffective, thus using good quality fuel and lubricants The Repair and use the right to choose and install the rubber washer, do not apply the sensor on the use of the manufacturer outside the provisions of the use of solvents and anti-sticking agent.
2, carbon deposition
Due to the engine combustion is not good, the formation of carbon in the oxygen sensor surface, or oxygen sensor into the oil or dust and other deposits into the internal, will hinder or block the external air into the oxygen sensor inside the oxygen sensor output signal inaccurate, ECU can not be timely To correct the air-fuel ratio. Resulting in carbon deposition, mainly for the fuel consumption increased, significantly increased the concentration of emissions. At this point, if the sediment is cleared, it will return to normal work.
3, oxygen sensor ceramic fragmentation
Oxygen sensor ceramic hard and brittle, with a hard object percussion or with a strong air purge, may make it fragmentation and failure. Therefore, the treatment should be particularly careful to find the problem in time to replace.
4, the heater resistance wire blown
For the heating type oxygen sensor, if the heater resistance wire ablation, it is difficult to make the sensor to the normal working temperature and lose its role.
5. The internal line of the oxygen sensor is disconnected.