How to Reset the AdBlue Warning Light?
2 Answers
The method to reset the AdBlue warning light is quite simple—just refill the diesel exhaust fluid (DEF), commonly known as automotive urea, vehicle urea, or automotive environmental urea. Below are the details related to the AdBlue warning light: 1. Automotive Environmental Urea: AdBlue is a diesel exhaust fluid, also referred to as automotive environmental urea. When the AdBlue warning light appears on the dashboard, it’s necessary to check and replenish the urea. Not all diesel vehicles require automotive urea; only those equipped with Selective Catalytic Reduction (SCR) exhaust after-treatment technology need it. 2. Principle: AdBlue is stored in a urea tank mounted on the chassis. The urea tank supplies the solution to a dosing unit (DU) installed on the chassis. The DU is controlled by the Engine Control Module (ECM). The DU uses compressed air from the vehicle’s system to generate an AdBlue spray, which is delivered to the nozzle in the engine’s exhaust system through a highly precise metering and pumping system.
The most common reason for the AdBlue light to come on is low fluid level, so you need to top up the AdBlue solution immediately. This stuff is a special environmental additive for diesel vehicles, used to reduce exhaust pollution. When the light comes on, don't panic—just find an auto repair shop or supermarket to buy a bottle of AdBlue and refill it yourself. It usually has a blue cap, and the filler port is typically located near the fuel tank. After topping it up, start the car and drive a few kilometers, and the light may turn off automatically. If it stays on, it could be a sensor error or the system not resetting—try turning the ignition off and restarting the vehicle. Remember not to mix other liquids when refilling; AdBlue must be pure to avoid clogging the injector. Make it a habit to check the fluid level every 5,000 km and top it up to the maximum mark. If left unresolved for a long time, the car may enter a speed-limiting mode or even fail to start, affecting driving safety. If you can't handle it yourself, visit a dealership—professional equipment can diagnose and fix it quickly.
