The AdBlue warning light on your Peugeot, whether it’s a 3008, 5008, 308, 508, 2008, Partner, or Expert, signals a problem with the emissions control system. While low AdBlue levels are the most common culprit, the issue might stem from faulty sensors, a malfunctioning SCR (Selective Catalytic Reduction) catalyst, or clogged AdBlue injectors. Understanding the causes, solutions, and reset procedures for this warning light is crucial for maintaining your Peugeot’s performance and adhering to emissions regulations.
Common Causes of the AdBlue Warning Light in Peugeot Vehicles
The AdBlue warning light can illuminate for various reasons, ranging from simple fluid level issues to more complex system malfunctions:
- Low AdBlue Levels: The most frequent cause. Regularly topping off AdBlue fluid is essential.
- Faulty Sensors: Malfunctioning sensors within the AdBlue system can incorrectly trigger the warning light, even with sufficient fluid levels.
- SCR Catalyst Issues: Problems with the SCR catalyst, responsible for converting harmful NOx emissions into harmless nitrogen and water, can activate the warning.
- Clogged AdBlue Injectors: These injectors spray AdBlue into the exhaust stream. If clogged, they disrupt the emissions control process.
- Low-Quality or Old AdBlue: Using substandard or expired AdBlue fluid can hinder the system’s functionality and trigger warnings.
- AdBlue Crystallization: In colder temperatures, AdBlue can crystallize, blocking lines and sensors.
Troubleshooting the AdBlue Warning Light: Step-by-Step Guide
If the AdBlue warning light appears on your Peugeot, follow these steps:
-
Check AdBlue Fluid Level: Consult your owner’s manual for instructions on checking and refilling the AdBlue tank.
-
Use High-Quality AdBlue: Ensure you’re using AdBlue fluid that meets ISO 22241 standards.
-
Inspect for Crystallization: If you suspect crystallization, try parking the car in a warmer location to allow the AdBlue to thaw.
-
Utilize an OBD2 Scanner: An OBD2 diagnostic tool can reveal specific error codes related to the AdBlue system, pinpointing the problem’s source. Common codes include P20E8 (low AdBlue pressure), P20F6 (level sensor fault), and P207F (low SCR efficiency).
-
Attempt a System Reset: After addressing any identified issues, try resetting the AdBlue system. This might involve using specialized software like Peugeot Lexia 3 Diagbox.
Resetting the AdBlue System with Peugeot Lexia 3 Diagbox
If troubleshooting and refills don’t resolve the warning light, a system reset might be necessary. Peugeot Lexia 3 Diagbox, official diagnostic software for Peugeot and Citroën vehicles, enables AdBlue system recalibration.
- Software Installation: Install and update the Peugeot Lexia 3 Diagbox software on a compatible computer.
- Vehicle Connection: Connect your Peugeot to the computer using an OBDII cable.
- System Selection: Navigate to the AdBlue system within the software interface.
- Reset Initiation: Select the “AdBlue Reset” option and follow the on-screen prompts.
- Test Drive: After the reset, perform a test drive to confirm the warning light is extinguished and the system functions correctly.
When to Seek Professional Help
If the AdBlue warning light persists despite these efforts, it’s crucial to consult a qualified Peugeot technician. Underlying issues with the SCR system, sensors, or injectors might require professional diagnosis and repair. Ignoring the warning light can lead to reduced engine performance, increased emissions, and potentially prevent the vehicle from starting. Addressing the issue promptly ensures optimal vehicle operation and compliance with environmental regulations.
