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Diesel Exhaust Fluid (DEF) is a crucial component in modern diesel engines, reducing emissions. A DEF doser injector injects DEF into the exhaust system. DEF leaks or malfunctions can trigger error codes like P20E8. Fixing DEF-related issues, like coolant line leaks or injector issues, is important for truck performance and compliance with emissions standards. Understanding and maintaining DEF systems is key for truck owners.

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