Adblue Warning Light (Solved!)

adblue warning light

‍Have you ever wondered how to fix Adblue system system malfunction? Well, we got you covered.

What should I do when the AdBlue® light in my car is on? If you drive a modern diesel vehicle, you may have come across the term “AdBlue” and the accompanying warning light on your dashboard.

This warning light is crucial to pay attention to, as ignoring it can lead to your vehicle not starting.

In this comprehensive guide, we will discuss the AdBlue warning light, its significance, and how to handle it when it appears on your dashboard.

What is AdBlue?

AdBlue is a diesel exhaust fluid (DEF) that is used in modern diesel vehicles to reduce harmful emissions. It is a clear, slightly corrosive, non-toxic liquid consisting of synthetic urea and de-ionized water in a 1:3 ratio.

When injected into the hot exhaust gas, the ammonia from the urea reacts with the harmful nitrogen oxide (NOx) emissions, converting them into harmless nitrogen and water vapor.

This results in diesel vehicles that emit significantly fewer pollutants.

The Purpose of the AdBlue Warning Light

The AdBlue warning light serves as a reminder for the driver to refill the AdBlue tank when it is running low.

The light is not a sign of any safety concern, but failing to heed the warning can prevent your engine from starting. When the low fluid warning appears, there is still ample time to refill the tank before it becomes essential.

However, it is crucial to remember to do so, or else you might end up with an empty tank and a stranded vehicle.

Read also >> Adblue System Malfunctions (Here Is How To Solve)

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What Does a Lit AdBlue Light Indicate?

A lit AdBlue light should alert you that it is time to refill your tank with AdBlue.

When the light comes on, be aware that you have a remaining range of approximately 2,400 km (1,491 miles). You must fill the tank with at least 4 liters of AdBlue for the light to go off.

It is essential to note that when the AdBlue tank has sufficient fluid, the light may take a few minutes to turn off.

If the light remains on, you should contact your dealership to inspect the system’s operation.

Recognizing the AdBlue Light on Your Dashboard

The AdBlue indicator may vary depending on the vehicle manufacturer. For example, PSA group vehicle models have a “UREA” warning light, while Volkswagen vehicles have an indicator shaped like a petrol pump.

Consult your vehicle’s manual to identify the dashboard light corresponding to AdBlue.

Consequences of Not Refilling AdBlue

If the AdBlue warning light is on and you cannot or do not refill the AdBlue tank, your vehicle will not be able to restart once you have driven an additional 2,400 km (1,491 miles).

Vehicles with selective catalytic reduction (SCR) technology are equipped with an electronic device that prevents the engine from starting in the absence of AdBlue. In this case, you will need to call a professional for service.

What Happens If I Overfill My AdBlue Tank?

AdBlue is a crucial component in modern diesel vehicles equipped with Selective Catalytic Reduction (SCR) technology.

It helps reduce harmful nitrogen oxide emissions and meet stringent emission standards. However, vehicle owners and fleet managers may have concerns about overfilling their AdBlue tanks.

In this article, we will discuss the potential consequences of overfilling an AdBlue tank, how to avoid it, and what to do if it happens.

Importance of AdBlue in Diesel Vehicles

Compliance with Emission Standards

AdBlue is an essential part of the SCR system, which enables diesel vehicles to comply with Euro 5 and Euro 6 emission standards.

These standards aim to reduce the environmental impact of nitrogen oxide emissions, which contribute to air pollution and health issues.

Role of AdBlue in SCR Systems

AdBlue, also known as Diesel Exhaust Fluid (DEF), is a non-toxic, non-flammable, and biodegradable solution composed of 32.5% urea and 67.5% deionized water.

When injected into the SCR system, it reacts with nitrogen oxide gases in the exhaust, converting them into harmless nitrogen and water vapor.

This process significantly reduces the emission of harmful pollutants from diesel vehicles.

Risks of Overfilling the AdBlue Tank

Damage to SCR System Components

Overfilling the AdBlue tank can lead to damage to various components within the SCR system.

Excess AdBlue can cause crystallization, leading to blockage of injectors, pumps, and nozzles. It can also result in increased pressure within the system, damaging seals, gaskets, and valves.

Vehicle Performance Issues

An overfilled AdBlue tank may cause performance issues in your vehicle. The SCR system may not function correctly, leading to increased emission levels and possible failure to meet emission standards.

In some cases, the vehicle’s engine management system may detect issues with the SCR system and limit power output or prevent the engine from starting.

Increased Maintenance Costs

Damage to SCR system components due to overfilling the AdBlue tank can result in costly repairs and increased maintenance costs.

Replacing damaged components and cleaning the system can be time-consuming and expensive.

How to Avoid Overfilling the AdBlue Tank

Know Your Vehicle’s AdBlue Capacity

To avoid overfilling your AdBlue tank, it’s essential to know the tank’s capacity in your vehicle.

AdBlue tanks vary in size, depending on the make and model of the vehicle. Consult your vehicle’s owner’s manual or contact the manufacturer to determine the appropriate AdBlue capacity for your vehicle.

Monitor AdBlue Levels

Regularly monitor the AdBlue level in your vehicle to ensure that it remains within the recommended range.

Many vehicles have an on-board display that indicates the AdBlue level, while others may require manual inspection.

It’s crucial to refill the AdBlue tank before it becomes empty, as running out of AdBlue can cause the vehicle to enter a restricted performance mode or prevent the engine from starting.

Use a Dedicated AdBlue Dispensing System

When refilling your AdBlue tank, use a dedicated dispensing system to ensure accurate and controlled filling.

AdBlue dispensing systems are designed to prevent overfilling by automatically shutting off when the tank reaches its capacity.

These systems also help avoid contamination of AdBlue, which can lead to SCR system issues.

What to Do If You Overfill Your AdBlue Tank

Do Not Start the Engine

If you suspect that you have overfilled your AdBlue tank, do not start the engine.

Starting the engine may circulate the excess AdBlue throughout the SCR system, causing damage to components and potential performance issues.

Consult a Professional

In the event of an overfilled AdBlue tank, consult a professional mechanic or your vehicle’s manufacturer for advice on how to proceed.

They can provide guidance on safely draining the excess AdBlue and inspecting the SCR system for potential damage.

Perform a System Inspection

After draining the excess AdBlue, it’s essential to perform a thorough inspection of the SCR system to identify any damage or blockages caused by overfilling.

A professional mechanic can help identify any issues and recommend the necessary repairs or maintenance.

Schedule Regular Maintenance

To prevent future overfilling incidents, schedule regular maintenance for your vehicle’s SCR system.

Regular maintenance can help identify and address potential issues before they become costly problems. It also ensures that your vehicle continues to meet emission standards and perform optimally.

How and Where to Refill Your AdBlue Tank

There are two ways to refill your AdBlue tank:

  1. Visit a petrol station equipped with an AdBlue pump. Be careful not to use a heavy-duty pump with a high flow rate, as it is not suitable for light vehicle tanks.
  2. Purchase a 5L or 10L canister and pour the solution directly into the tank.

You can refill the AdBlue tank on your own, ensuring that you fill the AdBlue tank and not the fuel tank.

The AdBlue tank is usually identified by its blue cap and is often located next to the fuel door or under the hood or inside the trunk of the vehicle.

Can I top up my AdBlue myself?

Yes, you can top up Adblue yourself. Filling up with AdBlue on your own does not affect your vehicle’s manufacturer’s warranty.

However, be sure to fill your tank with AdBlue to avoid any issues.

Handling the AdBlue Warning Light

If the AdBlue warning light appears on your dashboard, it is essential to refill the tank as soon as possible.

Most vehicles will provide a warning when there are about 2-3 liters of AdBlue remaining, giving you an approximate range of 1,200 to 1,500 miles.

Some vehicles will display a countdown in miles or the number of times the vehicle will start before it refuses to operate.

It is crucial to treat these warnings as an immediate reminder to top up the AdBlue, rather than waiting until the last minute.

The Importance of AdBlue in Diesel Vehicles

Diesel engines have come a long way since their early days as noisy, slow, and polluting machines.

Today’s diesel engines are sophisticated, high-tech, and provide impressive fuel efficiency. However, this efficiency comes at the cost of increased emissions.

AdBlue serves as a solution to this issue, allowing diesel vehicles to meet stringent emissions regulations without sacrificing performance.

How to Reset the AdBlue Warning Light

If your AdBlue warning light persists even after refilling the tank, you may need to consult a professional for assistance.

Companies like ECUFLASH specialize in tuning and programming vehicle ECUs, including the removal of AdBlue warning faults.

AdBlue Warning Faults

Diesel engines have come a long way since their early days as noisy, slow, and polluting machines.

Today’s diesel engines are sophisticated, high-tech, and provide impressive fuel efficiency. However, this efficiency comes at the cost of increased emissions.

AdBlue serves as a solution to this issue, allowing diesel vehicles to meet stringent emissions regulations without sacrificing performance.

In Conclusion

The AdBlue warning light is an essential reminder for drivers of modern diesel vehicles to refill their AdBlue tanks.

Ignoring this warning can lead to your vehicle not starting and expensive repair bills.

By understanding the purpose of the AdBlue warning light and how to handle it, you can ensure your diesel vehicle remains efficient and compliant with emissions regulations.

Stephan K.

I have been working as a mechanic for over 13 years and have been deeper into advanced automotive diagnostics for some years.

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