What AdBlue does
Many modern diesels use selective catalytic reduction (SCR), injecting AdBlue into the exhaust to cut nitrogen oxide emissions. If the system detects a fault it warns the driver and, after a set distance, can prevent the engine restarting.
Common faults
Typical causes include failed NOx sensors, AdBlue pump or heater faults (often after cold weather), crystallised or blocked injectors, contaminated or poor-quality fluid, and wiring problems. Some faults clear once the underlying part is put right and the system is reset with diagnostic equipment.
How we approach it
We read the fault codes and live data, test the components involved and tell you what’s wrong before any parts are fitted. AdBlue systems are a legal requirement on the vehicles that have them, so the aim is always to make the system work, not to switch it off.
Questions about adblue solutions
My dash says the engine won't start in a few hundred miles. What should I do?
Get it looked at before the countdown runs out. Topping up AdBlue fixes some warnings, but if the tank is full the system has found a fault that needs diagnosing.
Can you turn off AdBlue?
No. Disabling AdBlue/SCR on a road vehicle is illegal in the UK. We find and fix the fault so the system works properly.
