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An AdBlue NOx sensor fault means one of the sensors monitoring nitrogen oxide levels in your exhaust, usually one positioned before the SCR catalyst and one after it, has stopped giving the ECU an accurate reading. It’s a different fault…

A failed AdBlue dosing test means your vehicle’s own self check, the one that confirms AdBlue is actually being injected into the exhaust in the right amount, hasn’t come back clean. It’s not the same as a low fluid warning.…

“Communication fault” is one of those messages that sounds worse than it usually is, and also more confusing. Your car isn’t telling you the tank is empty or the fluid is bad. It’s telling you something much stranger: that one…

Usually, yes. We say that a lot in this workshop, mostly because the pump gets blamed first almost every single time someone rings up about low pressure, and it’s rarely the actual culprit. It’s the obvious suspect. The moving part…

An AdBlue heater fault means the car has found a problem with the parts that stop AdBlue from freezing. AdBlue is mostly water, and it freezes at about minus 11 degrees Celsius. Frozen AdBlue can’t be pumped, so the car…

Depends entirely on what’s actually gone wrong with it, which isn’t the answer most people want when they’re staring at a warning light and trying to work out roughly what this is going to cost. Some injector faults are a…

Depends what got in there, and how long it sat before anyone noticed. That’s genuinely the whole answer, annoying as it sounds. A tank that picked up a splash of diesel and got caught within a day or two is…

Sometimes. Sometimes not. Annoying answer, we know, but it’s the true one, and it’s the question we get asked almost every week here at AdBlue Fault, usually by someone who’s already been quoted a full pump replacement somewhere else and…

Pressure climbs. Then it falls back before the dosing module can actually use it. Then it climbs again. That cycle, over and over, every few minutes, with the warning light flickering in time with it, is the real giveaway here.…

An AdBlue pressure sensor fault means the sensor watching pressure in your SCR system is sending the ECU a reading that doesn’t match reality. Not low fluid. Not a dosing problem by itself. A pressure signal that’s wrong, missing, or…