انسداد مرشح جسيمات الديزل

A particulate filter restricted to the point that it obstructs the engine's exhaust, rather than one merely carrying a normal load of soot awaiting its next regeneration. That distinction is the whole of this entry, and it decides whether the repair is a drive cycle or a new filter. Soot is combustible and burns away during regeneration; ash is not, and it accumulates for the life of the filter.

A blocked filter presents as a power loss that worsens with load, because the engine is pumping against a restriction that grows with flow. Boost falls short of target even with a healthy turbocharger, exhaust temperatures rise, and the turbocharger's own codes may appear first — which is why this cause sits on boost and temperature codes rather than only on filter codes.

Ash-blocked is the end of the filter's service life and is not a fault. It arrives after a high mileage of normal use, mostly from engine oil additives. Soot-blocked before that mileage is a symptom of something else — repeated short journeys that never allow regeneration, a fault that has been aborting regenerations, or an injector or turbocharger fault making far more soot than the filter was designed for. Replacing the filter without finding that cause replaces it again, so read the stored regeneration history before ordering the part.