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How to Test an O2 Sensor
time2011/10/18
On a gasoline engine, an oxygen sensor is used to ensure that the proper air fuel ratio is reaching the engine.
Some automobile manufacturers recommend that oxygen sensors should be replaced once every 100,000 miles whether they are working or not. However, this can be very expensive, especially since many newer cars and trucks have up to 4 different O2 sensors.
Usually, a check engine light will provide the first indication that you might have a bad oxygen sensor. Often, the engine code will simply state that there is a problem with the O2 Sensor, or it may say that there is a "heater circuit malfunction."
Since O2 sensors can be very expensive and the problem might not be with the oxygen sensor itself, but could be several other factors, it is a good idea to test your O2 sensor before replacing it.
Oxygen sensors can be tested both on the vehicle and off, but many prefer to leave the oxygen sensor on the vehicle. However, by taking the oxygen sensor off, you are able to visually inspect the sensor, which can often provide a good indication that there is a problem, and testing the sensor is also a little easier.
This article describes how to test an O2 Sensor while it is still on the vehicle.
Some automobile manufacturers recommend that oxygen sensors should be replaced once every 100,000 miles whether they are working or not. However, this can be very expensive, especially since many newer cars and trucks have up to 4 different O2 sensors.
Usually, a check engine light will provide the first indication that you might have a bad oxygen sensor. Often, the engine code will simply state that there is a problem with the O2 Sensor, or it may say that there is a "heater circuit malfunction."
Since O2 sensors can be very expensive and the problem might not be with the oxygen sensor itself, but could be several other factors, it is a good idea to test your O2 sensor before replacing it.
Oxygen sensors can be tested both on the vehicle and off, but many prefer to leave the oxygen sensor on the vehicle. However, by taking the oxygen sensor off, you are able to visually inspect the sensor, which can often provide a good indication that there is a problem, and testing the sensor is also a little easier.
This article describes how to test an O2 Sensor while it is still on the vehicle.