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The lambda sensor, or lambda probe, works in collaboration with the catalytic converter and both are placed in the exhaust line. In new cars, there are two lambda sensors, before and after the converter, and the probes "report" on the exhaust gas blown through the catalytic converter. The sensors measure the ratio between gasoline and air, i.e. the amount of oxygen in the exhaust. In this way, the lambda sensors ensure that the amount of gasoline is fine-tuned and that the catalytic converter can clean it.

In old petrol cars, there is only one lambda probe next to the converter. So there may be a difference in where the sensor is located, but no matter whether there is one or two, they ensure a well-functioning exhaust.

What is the difference between an oxygen sensor and a lambda sensor?

If you are wondering what an oxygen sensor is, the answer is that basically, the oxygen sensor - or the o2 sensor - is the same as a lambda sensor.

They both make sure to measure the ratio between oxygen and fuel in the exhaust gas.

How to check if the lambda sensor is working

The engine light in your dashboard is on. That’s the lambda sensor fault symptom.

So how do you test a lambda sensor? The mechanic attaches special test equipment to see where the fault is located on the exhaust line, and if the values match.

Unfortunately you cannot check if your car's lambda sensor is defective, unless you have the right equipment. So be sure to get the mechanic's view. Your car cannot go through the MOT if the lambda sensor does not work, and you use more fuel because it does not regulate the gasoline properly.