Case Study: How Do I Reset My Mercedes AdBlue Warning?
If you’ve ever seen the “Engine Start Not Possible” warning on your Mercedes dashboard, particularly in models like the C300, you know how alarming it can be. But don’t worry—this guide will walk you through the steps needed to diagnose and reset the AdBlue warning, helping you avoid unnecessary stress and costly repairs.
Introduction: Adblue Reset Mercedes
Understanding the AdBlue System in Mercedes-Benz Vehicles
AdBlue is a critical component in the Selective Catalytic Reduction (SCR) system used in diesel engines to reduce nitrogen oxide (NOx) emissions. It’s a urea-based solution that, when injected into the exhaust system, breaks down harmful gases into harmless nitrogen and water vapor. However, if the AdBlue system encounters issues, it can trigger a warning that may prevent your engine from starting. Maintaining this system is essential for both vehicle performance and environmental compliance.
The Common Warning: “Engine Start Not Possible”
The “Engine Start Not Possible” message is a common issue faced by Mercedes-Benz owners, especially those driving the C-Class 300. This warning indicates a serious problem with the AdBlue system that must be addressed immediately to ensure your vehicle continues to operate smoothly.
Step 1: Diagnosing the Issue “Engine Start Not Possible“
Performing a Quick Test
The first step in resolving the AdBlue warning is to perform a quick test using a diagnostic tool. This test will help identify any error codes stored in the engine management and SCR calculators, which are crucial for diagnosing the root cause of the problem.
Possible Error Codes
During the quick test, you may encounter the following system error codes: 16D300, 16D400, 16D500, 15EA00, 15EB00, 15EC00, 16CE00, 16CF00, P13DF00, P13E300, P13E400, P13E500, and P13DF09. These codes are typically accompanied by at least one fault code from the SCR calculator. It’s important not to clear the quick test results prematurely, as this could erase valuable information needed to identify the origin of the fault.
Important Note: Do Not Clear the Quick Test Prematurely
Clearing the quick test before resolving the origin fault code can lead to a loss of critical diagnostic information, making it harder to pinpoint and fix the issue. Always address the root cause first.
Step 2: Identifying the Root Cause
Common Causes of AdBlue System Errors
Several factors can trigger the AdBlue warning and related error codes. These include:
- AdBlue Quality: Contaminated or low-quality AdBlue can cause system malfunctions.
- AdBlue Level Sensor: A faulty sensor can incorrectly report the AdBlue level, triggering a warning.
- NOx Sensors (Before and After SCR Catalyst): Malfunctioning NOx sensors can disrupt the SCR process, leading to errors.
- AdBlue Dosing Valve: Issues with the dosing valve can affect the flow of AdBlue into the exhaust system.
- False Contact: Electrical issues such as loose or corroded connections can trigger warnings.
- AdBlue Pump: A malfunctioning pump may fail to deliver AdBlue properly.
- Heating Element: Problems with the heating element can prevent AdBlue from reaching the required temperature for effective use.
Addressing the Origin Fault Code
It’s crucial to resolve the original fault code in the engine management calculator before attempting to reset the system. This step ensures that the root cause of the problem is fully addressed, preventing the warning from reappearing.
Step 3: Resetting the AdBlue Warning
When to Reset the AdBlue Warning
Once you’ve identified and fixed the root cause of the error, you can proceed with resetting the AdBlue warning. For vehicles equipped with OM651 or OM642 engines, this reset process usually requires the use of XENTRY Diagnostic, a specialized Mercedes diagnostic tool.
Using a Mercedes Diagnostic Tool
To reset the AdBlue warning, follow these steps:
- Start the Guided Control: After resolving the system fault code, initiate the guided control in the diagnostic tool.
- Reset the Warning Message: Click on the “Reset warning message…” link.
- Outcome: If the message “successfully performed” appears, the system fault has been cleared. If the message “Reset failed” appears, an adaptation drive is required.
Step 4: Adaptation Drive (If Required)
When an Adaptation Drive is Necessary
If the reset attempt fails, an adaptation drive may be necessary to clear the system error. This drive is a specific procedure designed to help the vehicle’s systems recalibrate and recognize that the fault has been corrected.
Adaptation Drive Procedure
- Initial Steps: Turn off the ignition, restart the car, and warm it up for about 10 minutes (coolant temperature should reach at least 80 °C/176 °F, and catalyst temperature at least 250 °C/482 °F).
- Consistent Driving: Drive for 30 minutes at a consistent speed between 80 km/h (50 mph) and 120 km/h (75 mph), with occasional deceleration phases.
- Final Check: After the drive, check the fault code status. If it’s still active, clear the error code manually. If the warning persists, repeat the drive according to a more detailed profile:
- Drive at a constant speed (80-90 km/h or 50-56 mph) for 5 minutes without accelerating or decelerating.
- Gradually increase speed to 100-110 km/h (62-68 mph) and decelerate for 15-25 seconds. Repeat this process five more times.
Conclusion
Summary of Steps to Reset the AdBlue Warning
Resetting the AdBlue warning in your Mercedes-Benz involves a systematic approach: diagnosing the issue with a quick test, identifying and fixing the root cause, and finally, resetting the system using a diagnostic tool. In some cases, an adaptation drive may be necessary to fully clear the warning.
Additional Tips
- Regular Maintenance: Regularly check and maintain your AdBlue levels to avoid unexpected warnings.
- Use Quality AdBlue: Always use high-quality AdBlue fluid to prevent contamination and system errors.
By following these steps, you can efficiently reset the AdBlue warning in your Mercedes and keep your vehicle running smoothly.
Which Mercedes-Benz models require an AdBlue reset?
AdBlue reset can be applicable to several Mercedes-Benz models, primarily those equipped with diesel engines that utilize the SCR (Selective Catalytic Reduction) system to reduce emissions. Here are some common Mercedes-Benz models that might require an AdBlue reset:
- Mercedes-Benz C-Class (e.g., C300)
The C-Class 300 is a popular model that often uses AdBlue in its diesel variants. - Mercedes-Benz E-Class (e.g., E350d, E300d)
The E-Class W213, particularly its diesel models, uses AdBlue to meet emission standards. - Mercedes-Benz GLE (e.g., GLE 350d)
The GLE SUV with a diesel engine will also have an SCR system requiring AdBlue. - Mercedes-Benz S-Class (e.g., S350d, S400d)
The S-Class diesel variants ( S221, S222, S223) use AdBlue for emissions control. - Mercedes-Benz G-Class (e.g., G350d, G400d)
The G-Class diesel models are equipped with AdBlue systems. - Mercedes-Benz CLA (e.g., CLA 250d)
The CLA’s diesel versions (CLA 117 and CLA 118) also utilize AdBlue for emissions control. - Mercedes-Benz GLB (e.g., GLB 220d)
The GLB’s diesel variants have SCR systems that require AdBlue. - Mercedes-Benz GLS (e.g., GLS 350d)
The GLS SUV uses AdBlue in its diesel engines.
When to Perform an AdBlue Reset
- AdBlue Warning Light: If you see warnings related to AdBlue, such as “Engine Start Not Possible,” it may indicate the need for a reset after addressing the underlying issue.
- Diagnostic Errors: If error codes related to the AdBlue system are present and have been addressed, a reset might be necessary to clear these codes and reset the system.
Ensure that any faults related to the AdBlue system are diagnosed and repaired before performing a reset to prevent recurring issues.
What does AdBlue engine start not possible mean?
Mercedes-Benz vehicles equipped with AdBlue technology may experience issues indicated by an illuminated Check engine light with the message “Check AdBlue” or an inability to start engine after a certain number of kilometers or miles in the form “engine start not possible in XXX KM/Miles” . When these signs occur, using a Mercedes diagnostic tool typically reveals fault codes related to the AdBlue system stored in the engine management computer. It is crucial to address these issues promptly to ensure the proper functioning of the vehicle and maintain compliance with environmental emissions standards.
Before delving into possible causes of this issue, as an owner of a Mercedes vehicle, it is important to grasp some basic concepts about AdBlue technology.
The AdBlue system, also known as SCR (Selective Catalytic Reduction) in the context of Mercedes cars, is an innovative technology used to reduce exhaust gas emissions, especially nitrogen oxides (NOx), which contribute to air pollution.
How does Mercedes AdBlue work?
AdBlue is an aqueous solution composed of purified urea and demineralized water. This solution is injected into the vehicle’s exhaust system, upstream of the particulate filter, where it chemically reacts with nitrogen oxides (NOx) present in the exhaust gases. This reaction converts the NOx into harmless nitrogen and water, significantly reducing polluting emissions.
In Mercedes-Benz vehicles equipped with the SCR system, AdBlue is stored in a dedicated tank, typically located near the fuel tank. A sensor monitors the AdBlue level, and the vehicle’s electronic system notifies the driver when the AdBlue level is low, prompting them to refill it.
AdBlue is injected into the exhaust system at specific points in the driving cycle, depending on the engine’s needs and the emissions produced. This process helps to keep the vehicle’s emissions within legal limits while improving energy efficiency and reducing environmental impact.
Adblue Advantages
Emissions Reduction: The use of this technology significantly reduces NOx emissions, thereby improving air quality and complying with stringent environmental standards.
Environmental Standards Compliance: Vehicles equipped with this system adhere to the latest Euro 6 emissions standards set by the European Union to mitigate the environmental impact of cars.
Efficiency Enhancement: By reducing polluting emissions, Mercedes-Benz AdBlue also helps optimize engine efficiency, potentially resulting in more fuel-efficient consumption.
Durability and Performance: By ensuring the proper functioning of the selective catalytic reduction system, Mercedes AdBlue helps maintain engine durability and performance over the long term.
Overall, the AdBlue system is an advanced technology that promotes cleaner and environmentally friendly driving while ensuring compliance with the strictest environmental standards. Its use contributes to reducing polluting emissions, thus protecting the environment and enhancing the quality of the air we breathe.
