What is SCR, DPF, DEF?

SCR is an acronym for Selective Catalytic Reduction, an Emission Control System in the exhaust system downstream from the engine and DPF (Diesel Particulate Filter).

SCR Emission Control Systems consist of a catalyst, a reducing agent (DEF), and a dosing system which injects a mist of the reducing agent DEF into the hot exhaust.

This document will explain the concept and operation of the DPF SCR DEF system

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