Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

Theoretical Operation of the AdBlue System on Peugeot/Citroen

Model: Citroen Citroen Various
Part: AdBlue warning light

Video tutorial

In this video, we see an animation explaining the theoretical operation of the PSA pollution control system with AdBlue: we observe the position of the catalyst relative to the engine, and the AdBlue tank on the opposite side of the vehicle. In the centre is the catalyst with the DPF: a diesel engine emits carbon monoxide, unburnt hydrocarbons, nitrogen oxides, and particulates, which are eliminated in three steps using the AdBlue treatment.

The first step is that all these gases pass through the catalyst; the second step is where the SCR valve converts nitrogen oxides into water and nitrogen with the introduction of AdBlue. Finally, in the third step, there is a 99.9% reduction in particulates.

All very nice in theory, but unfortunately, we know the difficulties this system has caused users.


Updated on 9 September 2026 by ScegliAuto


Related tutorials

What is the Most Common Issue with the AdBlue System in Your Citroen?
What is the Most Common Issue with the AdBlue System in Your Citroen?
Citroen Citroen Various The most common issue with the AdBlue system in your Citroen occurs when the fluid level in the tank reaches the minimum threshold. In this case, the…
Reset of the AdBlue warning light for Citroen Dispatch - Peugeot Expert.
Reset of the AdBlue warning light for Citroen Dispatch - Peugeot Expert.
Citroen Citroen Various The following steps will show us how to reset the AdBlue fluid warning light on the Citroen Dispatch, as well as on the Peugeot Expert. Before perfor…
Resetting the AdBlue Warning Light on the Citroen Dispatch - Opel Vivaro
Resetting the AdBlue Warning Light on the Citroen Dispatch - Opel Vivaro
Citroen Citroen Various These brief and simple steps will show you how to reset the AdBlue warning light on the Citroen Dispatch, as well as the Opel Vivaro. To reset the Ad…

How to Set the Time in an Audi A4?

In this tutorial, you will see how to set the time in an Audi A4, a very simple and quick operation to perform after replacing the battery or when the time changes. First, insert the key and turn on the instrument cluster. Then, press the "SETUP" button located on the center console. Next, press the upper left arrow button, navigate to the "Time" option, and use the central knob to adjust the clock. Finally, set any necessary formats and save by returning to the main screen.

Watch the video!


by ScegliAuto

More videos