Diesel exhaust fluid (DEF) light
The diesel exhaust fluid tank is low, or the DEF system has a fault. Many diesels limit speed or will not restart when the tank runs empty.
Check soon Color: Amber / yellow
Is it safe to drive?
Usually yes, carefully and for a short distance, but have it checked soon.
Also called: DEF light, AdBlue light.
What to do
- Refill with DEF (sold at gas stations and parts stores). Never put it in the fuel tank.
- If the light stays on with a full tank, have the system checked soon.
Symbols and their meaning can differ a little by make and model. Your owner's manual is the final word for your car.
Trouble codes often stored with this light
A scanner can read these codes. Each one points to a different cause:
Questions about the diesel exhaust fluid (DEF) light
What does the diesel exhaust fluid (DEF) light mean?
The diesel exhaust fluid tank is low, or the DEF system has a fault. Many diesels limit speed or will not restart when the tank runs empty.
Is it safe to drive with the diesel exhaust fluid (DEF) light on?
Usually yes, carefully and for a short distance, but have it checked soon.
Does the diesel exhaust fluid (DEF) light look the same in every car?
Most makers use a similar symbol, but the drawing and the color can differ a little. Your owner's manual shows the exact symbol for your car.