Urea Pumps: Key Maintenance Tips to Avoid Emission Failures for Euro VI Diesel Vehicles
Mar 31,2026
For diesel vehicles meeting Euro VI, National VI B, or EPA emission standards, the urea pump is a core component of the Selective Catalytic Reduction (SCR) system. It delivers urea solution to the exhaust system, converting harmful NOx emissions into harmless nitrogen and water—directly determining whether the vehicle passes emission inspections and operates stably.
What is the Function of a Urea Pump?
The urea pump draws urea solution from the urea tank, pressurizes it to the required pressure (typically 0.8–1.2 MPa), and sprays it into the exhaust pipe. It works with the NOx sensor and SCR catalyst to achieve efficient emission reduction, ensuring the vehicle meets strict global emission regulations. Without a properly functioning urea pump, the vehicle will trigger a fault light, lose power, or even be restricted from driving.
Common Failure Symptoms of Urea Pumps
Illuminated emission fault light (triggered by urea injection failure codes, e.g., P2047, P204F)
Reduced engine power and limited speed (vehicle enters "limp mode" to protect the SCR system)
Urea solution not consumed or consumed abnormally (too fast/too slow)
Abnormal noise from the urea pump (indicating internal wear or blockage)
Failed emission inspection due to excessive NOx emissions
Essential Maintenance Tips
Use Qualified Urea Solution: Avoid low-quality urea (which can clog the pump and nozzles). Choose urea solution that meets ISO 22241 standards—this is the most effective way to extend the pump’s service life.
Regular Cleaning: Clean the urea pump, nozzles, and pipelines every 60,000–80,000 km to remove scale and deposits, preventing blockages and pressure loss.
Winter Protection: In low-temperature environments (below -11°C), use antifreeze urea solution to avoid freezing and cracking the pump and pipelines. Drain the urea solution if the vehicle is not used for a long time.
Timely Replacement: If the pump fails to pressurize or spray normally, replace it with a certified part to avoid damaging the entire SCR system (repair costs for SCR damage are 3–5 times higher than replacing the pump).
Our Urea Pump Solutions
As a professional auto parts exporter, we offer a full range of high-quality urea pumps compatible with major diesel vehicle brands (Toyota, Volkswagen, Ford, Hyundai, and heavy-duty truck models). All our urea pumps are tested to ISO and ECE standards, with stable pressure output and corrosion-resistant components. For global export clients, we provide custom packaging, labeling, and technical documentation to meet regional market requirements, along with competitive bulk pricing and reliable after-sales support.
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5F, Nanchen Building, No. 112, Liuqiao, Nanyuan East Road, Xialin Street, Chengxiang District,Putian City,Fujian Province