Exhaust from a diesel engine is naturally dirty. Soot and carbon from the exhaust will eventually clog up the EGR (exhaust gas recirculation) valve, EGR sensors, EGR cooler, and DPF (diesel particulate filter). Once these components start to clog, performance and fuel economy will drop meaning that these emissions-related parts will have to be cleaned or replaced. Some diesel owners choose to “delete” these emissions components instead.
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