What it does
AdBlue is injected into the exhaust of many modern diesel engines to cut nitrogen oxide emissions. If it runs out or the system fails, the engine management will usually warn the driver and then reduce power or prevent a restart.
Daily checks
- Check the AdBlue level on the dash and top up before it is low.
- Use the correct blue filler cap and clean fluid only. Do not put AdBlue into the diesel tank, or diesel into the AdBlue tank.
- Look for crystallised deposits or leaks around the tank, lines and filler.
- Act on warning messages straight away. They count down distance or time.
Cold weather
AdBlue can freeze in severe cold, although most vehicles have heating. If you see faults in winter, report them.
Never
Do not use emulators or defeat devices. They are illegal and can lead to prosecution.
Make the AdBlue level a tick item on your Kovi checklist.
General information, not legal advice or a substitute for official guidance. Check HSE, DVSA and GOV.UK for current requirements.