How to Reset DEF Light on Mercedes Sprinter: Easy Steps

Last Updated on October 9, 2023 by Albert Duke

To reset the DEF light on a Mercedes Sprinter, you can follow a hidden menu inspection process or DIY reset through the instrument cluster. These methods can help resolve DEF or check engine light problems on your Mercedes Sprinter.

Understanding Def (Diesel Exhaust Fluid)

The DEF light on a Mercedes Sprinter indicates a malfunction or low level of Diesel Exhaust Fluid (DEF). It is important to understand how to reset this light to ensure proper functioning of the vehicle’s exhaust gas after-treatment system.

What Is Def And Its Role In Mercedes Sprinter?

DEF (Diesel Exhaust Fluid) is an essential component of the Mercedes Sprinter’s emissions control system. It plays a crucial role in reducing harmful emissions and meeting emissions standards. Here’s what you need to know about DEF and its role in your Sprinter:

• DEF is a non-toxic, colorless liquid that consists of 32.5% urea and 67.5% deionized water.
• It is injected into the exhaust system to convert harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor.
• DEF helps the Sprinter comply with environmental regulations by reducing emissions and improving air quality.
• The Sprinter’s DEF system includes a DEF tank, a DEF metering unit, sensors, and a DEF light indicator on the dashboard.

Why Does The Def Light Come On?

The DEF light on your Mercedes Sprinter may come on for several reasons. It’s essential to understand why the light is illuminated to address the issue promptly. Here are some possible reasons why the DEF light may come on:

• Low DEF level: When the DEF tank is running low, the DEF light will come on to alert you to refill the tank.
• DEF system malfunction: If there is a problem with the DEF system, such as a faulty sensor or a clogged nozzle, the DEF light may come on.
• Incorrect DEF quality: If you’ve used a low-quality or contaminated DEF, the system may detect it and trigger the DEF light.
• Uncorrected DEF-related issues: If you’ve reset the DEF light without addressing the underlying problem, the light may come on again.

Remember, when the DEF light comes on, it’s crucial to take action to prevent any potential issues with your Mercedes Sprinter’s emissions system.

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Checking And Filling Def

The DEF warning light on a Mercedes Sprinter indicates a malfunction in the exhaust gas after-treatment system or a low, contaminated, or thinned level of Diesel Exhaust Fluid (DEF). To reset the DEF light, follow the steps outlined in online tutorials or consult a professional.

If you own a Mercedes Sprinter and are facing the issue of a DEF light coming on, it’s important to take immediate action. The DEF, or Diesel Exhaust Fluid, is essential for the proper functioning of your vehicle’s emissions system.

In this section, we will guide you through the process of checking and filling DEF fluid in your Mercedes Sprinter.

Check The Def Level In The Sprinter:

To ensure that your DEF tank is adequately filled, follow these steps:

• Start your Mercedes Sprinter and let it run for a few minutes to warm up.
• Locate the DEF gauge on your vehicle’s dashboard. It is typically marked with a blue symbol.
• Check the DEF level displayed on the gauge. If it is below the recommended level, it’s time to fill it up.

Where To Find The Def Fill Port:

The DEF fill port on the Mercedes Sprinter is usually located next to the fuel filler port. Look for a blue cap marked with AdBlue or DEF. Once you locate it, you are ready to proceed with filling the DEF fluid.

How To Purchase And Fill Def Fluid:

Here is a step-by-step guide to purchasing and filling DEF fluid in your Mercedes Sprinter:

• Purchase DEF fluid: DEF fluid is available at most auto parts stores and even some gas stations. Make sure you buy a high-quality DEF fluid that meets the requirements specified by Mercedes.
• Remove the DEF fill cap: Unscrew the blue DEF fill cap from the DEF fill port. Set it aside in a safe place.
• Fill the DEF fluid: Insert the nozzle of the DEF fluid container into the DEF fill port. Squeeze the container gently to start filling the DEF fluid into the tank. Take care not to spill any fluid.
• Monitor the DEF level: While filling the DEF fluid, keep an eye on the DEF gauge on the dashboard. Stop filling once the gauge reaches the recommended level.
• Secure the DEF fill cap: Once you have filled the DEF fluid to the appropriate level, screw the DEF fill cap back onto the fill port securely.
• Clean up any spills: If any DEF fluid spills during the filling process, clean it up immediately. DEF fluid can cause damage to painted surfaces if left unattended.

Remember, it is crucial to maintain the proper DEF level in your Mercedes Sprinter to ensure optimal performance and compliance with emission regulations. Regularly check the DEF level and refill as needed to avoid any DEF-related issues.

By following these steps, you can confidently check and fill DEF fluid in your Mercedes Sprinter, keeping the DEF light at bay and ensuring a smooth driving experience.

Resetting The Def Light

To reset the DEF light on a Mercedes Sprinter, you can follow a simple process. First, turn the ignition on and press and hold the o button on the instrument cluster. Wait for the beep and release the button, then use the M button to navigate the menu.

This will help you reset the service indicator light and resolve any DEF related issues.

Step-By-Step Process To Reset The Def Light On Mercedes Sprinter:

Resetting the DEF light on your Mercedes Sprinter is a straightforward process that can be done using the instrument cluster. Follow the step-by-step instructions below to successfully reset the DEF light:

• Start your Mercedes Sprinter: Turn on the ignition and wait for the instrument cluster lights to illuminate.
• Locate the DEF light: Look for the DEF (Diesel Exhaust Fluid) light on the instrument cluster. The DEF light is typically indicated by an image of an engine with a droplet symbol.
• Press the odometer reset button: Locate the odometer reset button on the instrument cluster. This button is usually located on the left-hand side of the cluster.
• Press and hold the reset button: Press and hold the odometer reset button for approximately 10 seconds or until the instrument cluster menu appears.
• Navigate to the Service menu: Use the menu buttons on the instrument cluster to navigate to the Service menu. The exact location and method may vary depending on the model of your Mercedes Sprinter.
• Select the DEF reset option: Once you are in the Service menu, look for the DEF reset option. Use the menu buttons to select this option.
• Confirm the reset: After selecting the DEF reset option, the instrument cluster will prompt you to confirm the reset. Press the reset button again to confirm.
• Wait for the reset to complete: The instrument cluster will display a message indicating that the DEF light has been reset. Wait for a few seconds until the message disappears.
• Turn off the ignition: Once the reset is complete, turn off the ignition of your Mercedes Sprinter.
• Start your vehicle again: Start your Mercedes Sprinter and check if the DEF light is no longer illuminated. If the light remains on, try the reset process again or consult a professional technician.

Using the instrument cluster to reset the DEF light:

• Start your Mercedes Sprinter by turning on the ignition.
• Locate the DEF light on the instrument cluster.
• Press the odometer reset button for approximately 10 seconds or until the instrument cluster menu appears.
• Use the menu buttons to navigate to the Service menu.
• Look for the DEF reset option and select it.
• Confirm the reset by pressing the reset button again.
• Wait for the reset process to complete and the instrument cluster to display a confirmation message.
• Turn off the ignition and start your vehicle again to check if the DEF light is no longer illuminated.

Proper method to ensure the light is successfully reset:

• Start your Mercedes Sprinter and wait for the instrument cluster to illuminate.
• Press and hold the odometer reset button for around 10 seconds to access the instrument cluster menu.
• Use the menu buttons to navigate to the Service menu.
• Locate the DEF reset option and select it.
• Confirm the reset by pressing the reset button again.
• Wait for the reset process to complete and the instrument cluster to display a confirmation message.
• Turn off the ignition and start your vehicle again to verify if the DEF light is no longer illuminated.

Remember, if the DEF light continues to stay illuminated even after performing the reset procedure, it may indicate a more serious issue with the DEF system. In this case, it is recommended to seek professional assistance or consult the vehicle’s manual for further troubleshooting steps.

Frequently Asked Questions For How To Reset Def Light On Mercedes Sprinter

Why Is My Def Light On But Tank Is Full?

The DEF light on your vehicle may be on even if the tank is full due to a malfunction or low level of Diesel Exhaust Fluid (DEF).

What Is The Def Warning Light On A Mercedes Sprinter?

The DEF warning light on a Mercedes Sprinter indicates a malfunction or low level of Diesel Exhaust Fluid (DEF).

Why Does My Def Light Stay On?

The DEF light stays on when the level of diesel exhaust fluid is critically low and needs to be refilled.

How Do I Reset My Mercedes Sprinter?

To reset your Mercedes Sprinter, follow these steps: 1. Start your vehicle’s engine. 2. Locate the instrument cluster on your dashboard. 3. Press and hold the “O” button on the instrument cluster. 4. Wait for a beep sound, then release the button.

5. Use the “M” button to browse through the menu options. 6. Find the “Service Reminder” option and select it. 7. Follow the prompts to reset the service indicator light. Remember to refill the DEF (Diesel Exhaust Fluid) if needed.

Conclusion

To effectively reset the DEF light on your Mercedes Sprinter, it’s important to follow the proper steps and procedures. By doing so, you can ensure that your vehicle is running smoothly and efficiently. One method to reset the DEF light is to turn on the ignition and press and hold the “O” button on the instrument cluster.

Wait for the beep, then release the button. You can then use the “M” button to navigate through the menu and reset the service indicator light. Another important aspect to consider is the DEF fluid itself. Make sure you fill the DEF tank properly and purchase DEF from a reliable source.

If the DEF light is still persistently on even after resetting, it could indicate a more serious issue that should be addressed by a professional. Following these steps and taking necessary precautions will help you maintain the performance of your Mercedes Sprinter and keep the DEF light from becoming a recurring problem.