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How to check the quality of AdBlue liquid in a diesel vehicle

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Here we’re looking at how to check the quality of AdBlue liquid in a diesel vehicle.

If the ECU is reporting a quality problem or fault code P025C, we need to know whether this is a sensor fault or something wrong with the liquid.

The way to test this is by using a Delphi diagnostic tool and a refractometer. What we’re looking for is exactly the right urea concentration in the liquid.

In this video we’ll show you:

• The procedure for testing AdBlue quality

• How to use the refractometer and diagnostic tool

What will happen to the vehicle if there’s something wrong with the AdBlue?

AdBlue liquid and systems have to work at 100%, otherwise it can impair the vehicle’s performance and functioning. The car can enter a degraded mode or limp mode. It can even have the car’s request to start blocked if the vehicle runs out of AdBlue.