How to Replace a Car’s Oxygen Sensor

The O2 sensor is a primary measurement device for the fuel control computer in a car to know if the engine is too rich or too slant. If suddenly note that your car is giving lower gas mileage than before, then the most possible reason is the bad O2 sensor. The poor gas mileage is the first sign of a bad O2 sensor. If you are a car fan then you must know how to remedy the problem by replacing the O2 sensor. Follow the fairly simple directions.

Things Needed

  • O2 sensor
  • Freeze spray
  • Oxygen sensor socket

Cars Sensor


Step 1:

For making sure that the O2 sensor needs to be replaced, use a generic code. It has to be hooked up according to the given instructions.

Step 2:

The O2 sensor has to be located under the car. If you can reach it easily then go ahead to turn and remove the sensor. More often, a specially made oxygen sensor socket should be obtained. This socket can be used for replacing the sensor.

Step 3:

Observe whether the sensor easily comes off. In case it does not come out easily, use freeze spray for loosening it.

Step 4:

The new sensor and harness should be positioned in place from where the other was removed following the instructions of the manufacturer. Check the seal to make sure that water and dirt will not penetrate. The excess wiring should be tucked out of sight.

How to know when the O2 sensor needs replacement

The signs will show up when there will be problems related to fuel. Symptoms of a poorly running O2 sensor will show up when the car is going through a tune up. The emission system is critical to a well-tuned automobile. One may think that diagnosing a bad O2 sensor sounds a little hard to tackle. It is actually easy and straightforward.

Tips and Precautions

  • To observe better when replacing the sensor, the car should be jacked up or raised on a rack.
  • If the check engine light is on, then furthers repairs will be needed. Sometimes it corrects itself after identifying the newly installed O2 sensor.
  • A bad O2 sensor should be replaced as soon as possible. Failure to do it can cause bad fuel efficiency and if prolonged, the catalytic converter can get damaged.

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