Using VAG-Com software I have found a fault code that says: Engine Coolant temp sensor. I will explain how to change the sensor and what tools you will need.

First, it is very hard to find the location of the sensor. Location is different in every car. In this article I will be talking about 2001 Audi A6 with Tdi engine. I have made a picture to show where to find the sensor.


A code of the water temp sensor was 076919501C. This was a stock Engine coolant temp sensor. Take a look at the image below. It was the same as you can see in the picture.

I have changed it to another Engine coolant temp sensor and the code of the new sensor was 059919501A. A new sensor was a little bit different. Look at the picture. Actually it was the same but the color was green.

It is a green 4 pin temperature sensor. You will also need an O-Ring and a clip. It is not necessary to buy a new clip because you may use an old one. But don't forget to buy an O-Ring. This will be necessary.

You will need a paste which becomes like a rubber after 10-15 minutes. Just spread the paste on the rear of the sensor. I cannot remember what paste I have used but I took a picture of the tube. Can't provide you more information on it. It was written Victor Reinz and Reinzosil on the tube as you can see from the picture.

It is not so easy to gain access to the sensor. And remember that a car must be cold before changing the sensor because when you remove the sensor a coolant will start leaking out of the car. Plug up something to stop leaking and then install a new sensor.