Air / Fuel Ratio Sensors

Replacement Parts > Emission Control > Sensors

Air / Fuel Ratio Sensors

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What is an Air/Fuel Ratio Sensor?

An Air/Fuel Ratio Sensor is an automotive part that monitors the ratio of air to fuel in an engine’s exhaust system. It helps the engine run properly by adjusting the fuel and air mixture accordingly.

What are the signs of a faulty Air/Fuel Ratio Sensor?

Signs of a faulty Air/Fuel Ratio Sensor include:

  1. Poor engine performance
  2. Poor fuel economy
  3. Check engine light on
  4. Erratic idle
  5. Excessive emissions


Can a faulty Air/Fuel Ratio Sensor cause damage to the engine?

Yes, a faulty Air/Fuel Ratio Sensor can cause damage to the engine over time. If the engine is running too rich or too lean due to incorrect readings from the sensor, it can cause damage to the cylinders, pistons, and spark plugs.

How do I replace an Air/Fuel Ratio Sensor?

Replacing an Air/Fuel Ratio Sensor involves the following steps:

  1. Disconnect the negative battery cable.
  2. Locate the Air/Fuel Ratio Sensor on the engine and disconnect the electrical connector.
  3. Unscrew the mounting bolts and remove the sensor.
  4. Install the new sensor and secure it with the mounting bolts.
  5. Reconnect the electrical connector.
  6. Reconnect the negative battery cable.


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