What Should You Do When the AdBlue® Warning Light Turns On?

AdBlue engine exhaust treatment solution

08/12/2025

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AdBlue® is an emissions-control solution that helps diesel engines reduce up to 90% of NOx, meeting Euro 4–5–6 standards.

Viet Duc Joint Stock Company supplies European-standard AdBlue®, certified by VDA and ISO 22241.

Meaning of the AdBlue® Warning Light

When the AdBlue® warning light turns on, it indicates that the diesel vehicle’s exhaust-treatment fluid level is low or that there is an issue within the SCR (Selective Catalytic Reduction) system. This system is essential for reducing NOx emissions and ensuring compliance with Euro 5 and Euro 6 standards.

If the warning is ignored, the engine may limit speed or fail to restart after several ignition cycles. This prevents vehicles from operating without the ability to control harmful emissions.

What To Do When the AdBlue® Warning Appears

1. Check the AdBlue® Level

As soon as the warning appears, check the tank level immediately.
Refill the AdBlue® tank as soon as possible to avoid engine performance limitations or no-start conditions.
Only use AdBlue® that meets ISO 22241 standards—never use water or low-quality substitutes to avoid damaging the SCR system.

Tip: Always carry a spare can of AdBlue® when driving long distances.

2. Refill with the Correct AdBlue® Solution

Open the AdBlue® tank cap (usually blue) and add the solution.
The required refill amount varies by vehicle, but typically 5–10 liters are needed to clear the warning.
After refilling, restart the vehicle—if the system detects sufficient fluid, the warning light should turn off automatically.

3. Check for Other SCR-Related Issues

If the warning light does not turn off after refilling:

Take the vehicle to an authorized service center for diagnostics.
Common issues include:
- Blocked AdBlue® injector
- Faulty NOx sensor
- Malfunctioning SCR components

4. Do Not Ignore the Warning Light

Depending on the manufacturer, if the warning is ignored:

The vehicle may limit speed to as low as 20 km/h
The engine may refuse to start after a certain number of restarts

How to Prevent the AdBlue® Warning from Appearing

Check regularly: Inspect the AdBlue® level every 5,000–10,000 km or during each maintenance service.
Use high-quality AdBlue®: Ensure purity to avoid injector blockage or SCR damage.
Maintain the SCR system: Clean injectors and check NOx sensors periodically.

Conclusion

When the AdBlue® warning light turns on, you should take timely action to avoid affecting your vehicle’s performance and drivability. Using the correct fluid, inspecting related components, and performing regular maintenance will help the system operate efficiently, reduce emissions, and ensure safe driving.

If you are looking for high-quality AdBlue®, contact Viet Duc Joint Stock Company for certified products at competitive prices.

Viet Duc Joint Stock Company is an authorized importer and distributor of AdBlue® exhaust treatment solution.

Our products are fully certified according to VDA (Verband der Automobilindustrie), ISO 22241, and DIN V 70070, meeting Euro 4/5/6 standards.

More product information is available at:https://vietducjsc.vn/dung-dich-xu-ly-khi-thai-dong-co-adblue-p243.html

Don’t let your vehicle stall because it runs out of AdBlue®!
Call us now:

Hotline: 089 669 1189

Or visit us directly at 274 Ngo Quyen Street, Hai Phong for consultation and a quotation.

Let Viet Duc Joint Stock Company accompany you in protecting your engine and ensuring your vehicle operates durably, efficiently, and in an environmentally friendly way!

Order online now at:

Shopee: https://shopee.vn/vietducjsc_official_store