Why does the urea light stay on after refilling the urea tank?
2 Answers
Here are the reasons why the warning light remains on after refilling the urea tank: 1. Poor combustion state: The main reason for the engine warning light to illuminate is poor combustion in the engine. 2. Engine knocking, usually manifested in three situations: (1) Lack of power in the vehicle; (2) Excessive engine noise; (3) Obvious knocking sound from the cylinders. In the first scenario, some engine warning lights may illuminate, while others may not. In the second and third scenarios, the engine warning light will definitely illuminate. 3. Internal causes for the engine warning light to illuminate: (1) Poor fuel quality; (2) Dirty engine cylinders with accumulated carbon deposits.
Last time the urea light came on, I thought just topping up the urea would do the trick, but the light kept flashing. It might be a sensor issue. Sometimes when the sensor gets dirty or fails, it can't properly detect that the urea tank is full. I had the same thing happen once while driving, and later found out it was a system clog that needed cleaning. You should also check the urea pump; if the pump is faulty, it can keep the light on. Additionally, the engine control unit might be faulty—it controls the whole system, and if it hasn't been reset or the software updated, topping up won't help. For safety, it's best to take it to a professional shop for a computer diagnosis rather than messing with it yourself, to avoid the system going into protection mode and limiting the vehicle's speed. Ignoring it for too long can lead to excessive emissions, and you might even fail the annual inspection. I recommend regular checks on these parts to keep them clean, which can save you a lot of hassle.
