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

The P20E8 Error is Not Always Due to the AdBlue Tank

Model: (Various brands) Various
Part: AdBlue warning light

The classic AdBlue error is the infamous P20E8, which all diesel owners have come to know and fear. In many cases, this error indicating low urea pressure points to a problem with the tank, and most mechanics don't even open the bonnet, assuming that's the issue. Advise them to open the bonnet, as they might find some clues; it could be a sealing issue with the system. In the case of the vehicle in the video, the engine is completely sprayed with something that is neither oil nor water or mud: it is urea that has leaked from the system, and thus the ECU rightly flagged the error, but the tank had nothing to do with it: you would have spent a lot of money, and the problem would have remained.

Updated on 11 August 2026 by ScegliAuto

Video tutorial

Related tutorials

Error P20E8 is not always the fault of the AdBlue tank
Error P20E8 is not always the fault of the AdBlue tank
(Various brands) Various In this video, we see that the notorious error P20E8 is not always attributable to the AdBlue tank, and that it is not necessary to replace it as oft…
LiquiMoly AntiCrystal Additive for AdBlue
LiquiMoly AntiCrystal Additive for AdBlue
(Various brands) Various The video explains a common problem with Euro 6 diesel engines: the crystallisation of AdBlue within the injector and system. This phenomenon can cau…
What Happens When AdBlue Runs Out?
What Happens When AdBlue Runs Out?
(Various brands) Various The video shows what happens when AdBlue runs out in the tank and what to do to avoid unpleasant issues. When the AdBlue level in the tank starts to …

How to Open the Bonnet of a Renault Megane if the Lever is Broken?

If the lever that unlocks the bonnet of the Renault Megane is broken or not functioning, there is an emergency procedure to unlock the mechanism: remove the right front grille located at the top of the bumper. Once the grille is removed, you can locate the actuator mechanism: by pulling the spring in this position, you can unlock the actuator, allowing you to lift the bonnet and access the components located inside the engine compartment. You can then close the bonnet simply by lowering it.

Watch the video!


by ScegliAuto

More videos