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The diesel particulate filter — also known as the DPF, soot filter, particulate filter, or FAP filter — captures carbon soot particles from diesel exhaust gases to meet Euro 5 and Euro 6 emission standards. The filter periodically regenerates by burning off accumulated soot at high exhaust temperatures. When regeneration fails repeatedly, the DPF blocks, triggering a warning light, limp-home mode, and ultimately a replacement requirement. CarParts247 stocks OEM and aftermarket DPF filters from Bosal, Walker, and Klarius for a wide range of diesel passenger cars and light commercials.
A DPF relies on reaching sufficient exhaust temperature during regeneration to burn off accumulated soot. Vehicles used predominantly on short urban journeys never reach the threshold temperature, preventing successful regeneration. Faulty EGR valves, injectors, or turbochargers that increase soot loading also accelerate DPF blocking.
A partially blocked DPF can often be cleared by a forced regeneration performed with a diagnostic tool, or by an extended motorway drive that sustains exhaust temperatures above 550 °C. Professional DPF cleaning (pressure-flushing with specialist fluid) is an option for heavily loaded but structurally sound filters. Replacement is necessary when the filter substrate is cracked or its soot-loading cannot be reduced by any regeneration method.
Always diagnose and fix the underlying cause of DPF failure before fitting a new filter — a new DPF will block just as quickly if the EGR, injectors, or driving pattern are unchanged.
Replace the associated differential pressure sensor at the same time — it may have been damaged or contaminated by the failed DPF. Ensure all soot is cleared from the upstream pipes before fitting. Programme the new DPF data (mileage counter reset) into the ECU using a diagnostic tool where the vehicle requires this.
Commonly searched OE numbers fitting DPF Filter from the TecDoc catalogue.