Most drivers and even some techs misunderstand how the modern one-box aftertreatment system actually works — and that misunderstanding leads to repeat failures, constant regens, derates, and unnecessary parts replacement. In this video, I break down step-by-step how exhaust flows through the one-box system, starting after the turbo, how fuel dosing is used to raise exhaust temperature, what the DOC actually does, how soot is trapped and oxidized in the DPF, and how DEF and the SCR reduce NOx bef

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