How Often Should the Urea Pump Be Replaced?
2 Answers
Car urea pumps should be replaced every 50,000 to 60,000 kilometers. What is a Urea Pump: The urea pump is a crucial component of the urea solution injection metering system. Its primary function is to extract urea solution from the urea tank, maintain a certain pressure, and then deliver it to the injection unit to meet the flow and pressure requirements of the injection metering system. The use of urea in vehicles is mainly to reduce harmful nitrogen oxides in the exhaust into nitrogen and water. It is generally used in diesel vehicles. The harmful substances in diesel vehicle exhaust are mainly nitrogen oxides and particulates. Technical measures can be applied within the engine to reduce particulate emissions, leaving mainly nitrogen oxides in the exhaust. By injecting urea into the exhaust after-treatment device, the urea decomposes into ammonia at high temperatures, which reacts with nitrogen oxides in the presence of a catalyst to produce harmless nitrogen and water. This device is called the SCR (Selective Catalytic Reduction) after-treatment system. How the Urea Pump Works: During operation, the urea pump first filters out impurities through a filter to prevent clogging of the pipelines and nozzles. The urea solution then enters the urea solution pump, where it is thoroughly mixed with compressed air before being sprayed out. After the urea pump stops injecting, the compressed air continues to blow in reverse for a period to blow residual urea back into the tank, preventing urea crystallization from blocking the pipelines. The urea sensor converts the liquid level signal into a resistance signal, which is then displayed on the dashboard via the control unit. When the urea level drops below 10%, the urea light will stay on to alert the user to add urea promptly.
My diesel car has been running for almost ten years. The urea pump isn't something you need to replace regularly like engine oil; it's more like a durable component, typically lasting over 100,000 kilometers. In my previous car, I only checked it when issues arose, such as low urea fluid levels or the engine light coming on, which might indicate a blockage. Just make sure to top up with high-quality AdBlue fluid regularly—don't cheap out on low-grade products. If the pump actually fails, the car will alert you, with a significant drop in power and a strange smell. Don't delay in such cases—head to a professional shop immediately for inspection and replacement. Remember, routine maintenance can extend its lifespan. For example, I check the fluid level monthly and keep it topped up. The maintenance manual might have recommendations, but most of the time, it depends on the car's condition.
