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If your AdBlue injector has stopped opening, the SCR system can’t get urea into the exhaust stream, and your car will usually let you know about it within a few miles. A warning light comes on, a fault code gets…

There’s a particular kind of frustration that comes with an AdBlue fault that seems to make no sense. You’ve filled the tank, you’ve had it checked, maybe you’ve even had a sensor replaced already and the warning light is still…

You top up the tank, clear the warning, and two days later it’s back. Or maybe it never went away at all. The AdBlue light just sat there glowing while the countdown to no-start quietly started ticking down. If you’ve…

Here’s the pattern that actually explains this one. Most SCR systems don’t start dosing AdBlue the second you turn the key. They wait until the exhaust gas reaches a specific operating temperature, usually somewhere around 200 to 250 degrees Celsius…

AdBlue freezes at around minus 11 degrees Celsius. That single fact is why every modern SCR system has a small heater built into the tank and lines, and it’s why, when that heater packs in, you tend to notice it…

The pump clicked off. The dash shows a full tank. The warning is still there. If that’s where you are right now, the fault was never really about fluid, and no amount of extra AdBlue is going to change that.…

P20EE means the Transit’s SCR system isn’t cutting NOx as well as it should. The van reads the exhaust gas before and after the catalyst, and when the drop between the two is too small, it logs P20EE and turns…

An Audi AdBlue system fault means the car’s emissions system has found a problem with how AdBlue is stored, measured or sprayed. The usual causes are a worn NOx sensor, a blocked injector, a weak pump, a failed heater, a…

That message on your dashboard means exactly what it says. Your car has detected a fault in its AdBlue system, and once the number on screen reaches zero, the engine won’t start again after you switch it off. Not “might…

You’re driving your Mercedes and the AdBlue light pops up on the dash. A bit annoying, but not the end of the world. You get it reset, either at a garage or with your own code reader, and off it…