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What is fault code mid128sid21smi3?

Anonymous

∙ 12y ago

Updated: 6/24/2025

Fault code MID 128 SID 21 SMI 3 is typically associated with a diagnostic trouble code in heavy-duty vehicles, indicating an issue related to the engine's aftertreatment system, specifically the diesel particulate filter (DPF) or exhaust gas recirculation (EGR). This code can suggest problems such as excessive soot accumulation, insufficient regeneration cycles, or sensor malfunctions. To address it, a thorough inspection of the DPF, EGR system, and related sensors is necessary, along with appropriate troubleshooting procedures. Always refer to the manufacturer's service manual for specific diagnostic steps and solutions.

AnswerBot

∙ 3mo ago

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