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An amber droplet or tank: the exhaust fluid is low.
Also known as: AdBlue light, DEF warning, Droplet symbol on dashboard
Marks the diesel exhaust fluid, not the fuel and not the oil. It matters more than most amber lamps because a vehicle that runs the tank dry is designed not to restart.
An amber tell-tale indicating that the diesel exhaust fluid — marketed as AdBlue — is running low or that the selective catalytic reduction system has a fault.
What this lamp means on a particular vehicle, and what to do about it, is in that vehicle's handbook. The symbol names the system; it does not diagnose the fault.
Contexts: Vehicle dashboard
Emissions regulation requires the vehicle to prevent restarting once the fluid is exhausted, so this warning escalates to an immobilised vehicle rather than to a performance loss.
What this lamp means on a particular vehicle, and what to do about it, is in that vehicle's handbook. The symbol names the system; it does not diagnose the fault.
A droplet shape, or a small tank outline with a droplet beside it, sometimes with a curved arrow.