The AdBlue warning light illuminates when the fluid level is low or a fault in the SCR system is detected. On modern diesel engines, ignoring this light can prevent the vehicle from restarting.
What Does the AdBlue Warning Light Mean?
The SCR (Selective Catalytic Reduction) system uses AdBlue to reduce nitrogen oxide emissions. When the level becomes critical, the ECU triggers an alert.
How Many Miles Can You Still Drive?
- First warning: 1,200 to 1,500 miles remaining
- Critical alert: 500 to 620 miles
- 0 miles on the counter: the vehicle will not restart
The exact range depends on the manufacturer and model.
Can You Continue Driving?
Yes, as long as the range is not at zero. However, once the counter reaches 0 miles, the engine will refuse to start even after a temporary stop.
How to Resolve the Issue?
1. Top Up AdBlue
Add the recommended amount (often a minimum of 5 litres).
2. Drive for a Few Minutes
The system may take a few miles to reset the alert.
3. Reset via OBD Diagnostic
If the fault persists, an OBD tool may be necessary.
Why Does the Light Stay On After Refilling?
- Faulty level sensor
- AdBlue injector fault
- SCR module issue
Estimated Repair Costs
| Service | Estimated Cost |
|---|---|
| AdBlue refill | €10 to €30 |
| Level sensor | €150 to €400 |
| SCR module | €800 to €2,000 |
Key Takeaway
An illuminated AdBlue warning light should be taken seriously. Even if the vehicle is still running, the remaining range is limited and can prevent any restart if it reaches zero.
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