Types Of Oxygen Sensors

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Oxygen sensors are critical components of modern engines. They are responsible for measuring the amount of oxygen in the exhaust gases and sending this information to the engine control unit (ECU). The ECU then uses this data to adjust the fuel injection and ignition timing, ensuring that the engine runs efficiently and produces minimal emissions.

Types of Oxygen Sensors

Zirconia Sensors

Zirconia sensors are the most common type of oxygen sensor. They consist of a ceramic element coated in a thin layer of platinum. The sensor works by measuring the difference in oxygen concentration between the exhaust gas and the air outside the sensor. This generates a voltage signal that is sent to the ECU.

Titania Sensors

Titania sensors are similar to zirconia sensors, but they use a different type of ceramic material. They are less accurate than zirconia sensors, but they are more durable and can withstand higher temperatures.

Wideband Sensors

Wideband sensors are a newer type of oxygen sensor that is capable of measuring the oxygen content of the exhaust gas over a wide range of concentrations. This allows for more precise control of the fuel injection and ignition timing, resulting in better engine performance and lower emissions.

Heated vs. Unheated Sensors

Another important distinction between oxygen sensors is whether they are heated or unheated. Heated sensors have an internal heating element that warms up the sensor to operating temperature quickly. This allows the sensor to start providing accurate readings as soon as the engine is started. Unheated sensors take longer to warm up, which can result in inaccurate readings during the first few minutes of operation.


There are several types of oxygen sensors available, each with its own strengths and weaknesses. Zirconia sensors are the most common, but titania sensors and wideband sensors are becoming more popular. Heated sensors are generally preferred over unheated sensors, but both can be effective when used correctly. By understanding the differences between these sensors, you can make an informed decision when it comes time to replace your oxygen sensor.