What is the adBlue warning light ?

The AdBlue warning light is a crucial indicator in vehicles equipped with diesel engines featuring an SCR (Selective Catalytic Reduction) system. It informs you about the AdBlue fluid level and any issues related to emissions treatment.

So, what should you do when this warning light turns on after several miles?

Signs and implications of an adBlue warning light

What does the adBlue warning light look like ?

The AdBlue warning light appears in different forms depending on your vehicle’s brand :

• A blue tank symbol
• An orange wave line with a cloud above
• An orange bottle pouring liquid
• An orange wave line with the mention "AdBlue" or "Urea"

They are often associated with an alert message on your dashboard, such as: "Refill AdBlue! Engine start impossible in 1,500 miles"

It can also be linked to other warning lights such as the check engine light, indicating more serious issues with your vehicle’s emissions system.

Understanding different warning messages

• Solid warning light : This usually means that the AdBlue tank is almost empty. It is crucial to refill as soon as possible to avoid breakdowns.
• Flashing warning light : This indicates a more serious issue with the AdBlue system. A diagnostic scan using a Car Diagnostics Scanner is recommended to identify the exact problem.
• AdBlue warning light + Check Engine Light : When both warning lights are on, this may indicate a failure in the emission control system. It is essential to visit a garage for corrective action.

Consequences of Ignoring the Warning Light

Ignoring the AdBlue warning light may lead to vehicle immobilization. Once the fluid runs out, the car may not start, requiring professional servicing. In some cases, an AdBlue pump failure could be the issue, necessitating replacement.

Solutions for managing adBlue issues

What to do If the warning light turns on ?

When the AdBlue warning light appears, the first step, regardless of your car brand—Peugeot, Citroën, Renault, BMW…—is to check the fluid level in the tank and refill it at a service station with an AdBlue pump, purchase a 5L or 10L canister, or ask your mechanic to refill it for you.

If the warning light persists after refilling, it could indicate a technical issue with the AdBlue system.

AdBlue warning light Peugeot – Citroën – Engine start impossible

For Peugeot vehicles, the warning light is orange and represented by waves with the word "AdBlue" above. It is often accompanied by a message warning about the remaining miles before the engine becomes impossible to start.

First, check the AdBlue fluid level. You can either refill it at a service station, buy one or more canisters, or ask your mechanic to do it. Once refilled, the warning light should turn off automatically.

If not, use a Car Diagnostics Scanner to clear the AdBlue warning light on your Peugeot or Citroën yourself.

AdBlue warning light Renault – Engine start impossible

If you own a Renault vehicle, the AdBlue warning light is orange and represented by waves with a cloud above. In most cases, it is associated with a message indicating engine start will be impossible within a certain number of miles.

Start by checking the AdBlue fluid level. You have several options: refilling at a service station, purchasing a 5L or 10L canister, or asking your mechanic to do it. The warning light should turn off afterward.

If it persists, use a Car Diagnostics Scanner to clear the AdBlue warning light on your Renault yourself.

Steps to follow when the warning light appears

1. Refill the AdBlue Tank : Use a manufacturer-approved AdBlue fluid to prevent damage to your vehicle.
2. Restart the Car : Sometimes, simply restarting the car after refilling the tank is enough to turn off the warning light.
3. Complete a Driving Cycle : The AdBlue warning light may turn off after driving a certain distance or completing multiple trips.
4. Diagnosis and Repair : If the warning light does not turn off, schedule an appointment at an authorized service center or garage. The issue may require further intervention, such as using a Car Diagnostics Scanner to inspect the electronic system.

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