How Often Should the Diesel Exhaust Fluid (DEF) Filter Be Replaced?

[VanLilah]

Car DEF filters should be replaced every 50,000 to 60,000 kilometers. The contaminant-holding capacity of DEF filters is limited, so even when using genuine DEF solution, regular replacement is necessary. Once the filter loses its filtering effectiveness, impurities in the DEF can cause system malfunctions. It is recommended to use genuine DEF solution and replace the DEF filter periodically to ensure proper functioning of the aftertreatment system, prevent engine torque limitation, and maintain normal vehicle operation. Diesel Exhaust Fluid (DEF) is a liquid used in SCR (Selective Catalytic Reduction) technology to reduce nitrogen oxide pollution in diesel vehicle exhaust. Its composition consists of 32.5% high-purity urea and 67.5% deionized water.