Modern cars are increasingly equipped with new technologies, apart from the comfort of use it can bring, technology also has the advantage of saving fuel or reducing the pollution emitted by our cars. This is exactly the subject of our article of the day, we are going to look at the problems of the lambda sensor on Volkswagen Passat , this sensor also called oxygen sensor plays an necessary purpose. To find out, first, we are going to find out what a lambda probe is utilized for, then, what are the lambda sensor problems on Volkswagen Passat and how to fix them.

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What is a lambda purpose on Volkswagen Passat?

So we begin our article with the benefit of a lambda sensor on Volkswagen Passat , we will first discover what is the role of this probe and then how it works.

Role of a lambda sensor on Volkswagen Passat

First designed by Volvo in the 1970s, it began to appear on our cars in the 1990s with the first EURO 1 emission specifications. Also called oxygen sensor on Volkswagen Passat , its objective is to regulate the amount of oxygen in the exhaust gases, this will allow the engine unit to modify the air/fuel mixture to reduce the pollution emitted by the car and lower the car’s fuel consumption.

Lambda sensor process on Volkswagen Passat

Before explaining you the different problems of lambda probe on Volkswagen Passat , we will look a little more in detail at its functioning to allow you to discover precisely how it works and thus to consider more serenely the correction of a problem related to it.
As we explained to you, a lambda probe has the task of controlling the amount of oxygen present in the exhaust gases . One could naively believe that this data is measured upstream of the combustion but it is on the contrary measured at the engine outlet . With the EURO 1 standard there was just one lambda sensor needed before the catalyst, but with the arrival of more drastic specifications there are now 2 lambda sensors, one before and one after the catalyst . The benefit is to have more precise data by compiling the two probes. These data are sent to the ECU which will modify the quantity of air and gasoline injected into the engine unit to improve the combustion .

Lambda sensor issue on Volkswagen Passat

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At last, we are now going to attack the part you are obviously most interested in this article, what to do if you have a lambda sensor issue on Volkswagen Passat . In a first step we will see how to find a lambda sensor HS and in a second step how to replace it.

How to know if a lambda sensor on Volkswagen Passat is HS

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It is necessary to know that a lambda sensor has generally speaking a lifetime of 150 000 km , this info can fluctuate according to the year of your Volkswagen Passat, your driving, and the good functioning of your engine unit. A poorly maintained engine unit that emits unburned gases may completely damaged your lambda sensor. One of the clues that can warn you of a faulty lambda sensor on Volkswagen Passat might be the engine unit light comes on, if you want to turn off the engine light of your Volkswagen Passat, do not hesitate to visit our dedicated article to discover the procedure to follow. The only effective way to be certain that you have a lambda sensor issue on your Volkswagen Passat and to pass your car to the diagnostic case, for that do not hesitate to seek advice from our guide which explains you Volkswagen Passathow to read the fault code of a Volkswagen Passat. Take note that if you have problems with one of your lambda sensors, the just remedy to correct them will be to replace the faulty sensor.

How to replace a lambda sensor on Volkswagen Passat?

And at last, we are going to concentrate on the correction of lambda sensor problems on Volkswagen Passat , by describing how to replace a lambda sensor.

The replacement of a lambda sensor is quite very easy to accomplish and you will be able to do it yourself with a minimum of tools and mechanical know-how. A lambda sensor is worth between 25 and 50€ , it is better to replace the 2 lambda sensors present upstream and downstream of your catalytic converter because if one of them is faulty the second one risks to drop you fairly quickly. To replace it, it will be required to put your Volkswagen Passat on candles and at the level of your catalyst unscrew your probes, disconnect them, reconnect them and screw the new ones . Once re-connected, you should not have any more problems with your lambda sensor on Volkswagen Passat.

If you need more guides on the Volkswagen Passat, go to our Volkswagen Passat category.