Do you know the Common Faults of Oxygen Sensor?

As a GEELY Oxygen Sensor Supplier, share with you.

GEELY Oxygen Sensor

Once the GEELY Oxygen Sensor fails, the computer of the electronic fuel injection system cannot obtain the information of the oxygen concentration in the exhaust pipe, so the air-fuel ratio cannot be feedback-controlled, which will increase the engine fuel consumption and exhaust pollution, and the engine will become unstable at idle , Lack of fire, surge and other failure phenomena. Therefore, it is necessary to promptly troubleshoot or replace [1].

Poisoning failure

Oxygen sensor poisoning is a frequent and difficult-to-control failure, especially for cars that often use leaded gasoline. Even new oxygen sensors can only work for thousands of kilometers. If only a slight lead poisoning followed by a case of unleaded petrol, the lead on the oxygen sensor's surface can be eliminated and normal operation resumed. However, often due to the excessively high exhaust temperature, lead invades its interior, hinders the diffusion of oxygen ions, and makes the oxygen sensor ineffective. At this time, it can only be replaced.

In addition, silicon poisoning is common in oxygen sensors. Generally speaking, the silicon dioxide generated by the combustion of silicon compounds contained in gasoline and lubricating oil, and the use of silicone gas emitted by silicone rubber sealing gaskets will invalidate the oxygen sensor. Therefore, good quality fuel and lubricating oil should be used. .

When repairing, correctly select and install rubber gaskets. Do not coat the sensor with solvents and anti-adhesives other than those specified by the manufacturer. Due to poor combustion of the engine, carbon deposits have formed on the surface of the oxygen sensor, or the inside of the oxygen sensor has become oily or Deposits such as dust can block or block outside air from entering the oxygen sensor, causing the signal from the oxygen sensor to be out of alignment, and the ECU cannot correct the air-fuel ratio in a timely manner. The formation of carbon deposits is mainly due to the increase in fuel consumption and a marked increase in emissions concentrations. At this time, if the sediment is removed, normal operation will resume. [1]

After the oxygen sensor is polluted, poisoned or aging, the adjustment frequency becomes significantly slower, and the voltage signal waveform also becomes nearly flat. Under normal circumstances, it usually fluctuates about 50 times a minute.

Ceramic chipping

The ceramic of the oxygen sensor is hard and brittle. Knocking with a hard object or blowing with a strong air flow may cause it to break and fail. Therefore, special care must be taken in handling and problems should be replaced in time.

Resistance wire burnout

The heater resistance wire is blown out. For a heated oxygen sensor, if the heater resistance wire is ablated, it is difficult to make the sensor reach the normal operating temperature and lose its effect.

Line break

The internal circuit of the oxygen sensor is disconnected.

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