This occurs if there are other mechanical issues which can affect the DPF, but also when poor quality or incorrect engine oil is used, when poor quality or incorrect fuel is used, or even if the vehicle is only used over short distances. Unfortunately when the DPF reaches about 80% soot saturation (this varies based on manufacturer), regeneration is no longer possible. The way this process works is by forcing unburnt fuel into the exhaust system and burning off the collected soot at high temperature to leave only a tiny residue of ash. Your vehicle is designed to sense this occurring, and through the feedback measured by pressure sensors, your vehicle engine management system will automatically perform a DPF regeneration which clears the soot and prevents blockage. Over time soot builds up inside the filter increasingly blocking the Diesel Particulate Filter.
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