What is lambda-sonde?

Lambda-sonde, also known as oxygen sensor or oxygen lambda sensor, is a key component of modern automobile engines. It is used to measure the amount of oxygen present in the exhaust gases and sends this information to the engine control unit (ECU) for controlling the air-to-fuel ratio of the engine.

The lambda-sonde is placed in the exhaust system of the engine, specifically in the exhaust pipe or manifold. It consists of a ceramic or metal housing containing a zirconium dioxide or titanium oxide sensing element. The sensing element has a coating of platinum and porous layer of ceramic material that allows the exhaust gases to diffuse into it.

As exhaust gases pass over the sensing element, it produces a voltage that is proportional to the amount of oxygen present in the exhaust. The ECU interprets this voltage signal and adjusts the fuel injection system to maintain the optimal air-to-fuel ratio for the engine. This helps to improve fuel efficiency and reduce emissions.

Lambda-sondes have evolved over time, with newer models having faster response times, broader measurement ranges, and improved durability. There are two types of lambda sensors - narrow-band and wide-band. Narrow-band sensors have a limited measurement range and are mainly used in older vehicles. Wide-band sensors have a broader range and are commonly used in modern vehicles.

In summary, the lambda-sonde is an essential component of automobile engines that helps to improve fuel efficiency and reduce emissions by measuring the oxygen content in exhaust gases.