EA288 – P246C: Excessive DPF ash accumulation; forced regeneration rejected.
by meccanic · rep 0 · 2026-07-05
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The tester refuses forced regeneration or interrupts it at a fixed percentage; the calculated ash mass is at/above the permissible limit. Vehicle with high mileage, used extensively in urban environments.
1 answers
Ash does NOT burn during regeneration – it is the mineral residue accumulated over the years; this is why the tester rejects it. Documented options: (1) professional external cleaning of the DPF (procedures using pressure pulses/flushing) – works when the ceramic monolith is intact; it should be checked BEFORE with differential pressure at a fixed speed and, ideally, by weighing; a cracked monolith makes cleaning useless; (2) replacement of the filter; (3) after any of these: CORRECT resetting of the ash/soot adaptations with the tester – a step that is often skipped, leading to chaotic regenerations later. Checking the cause of running with high ash levels (oil consumption, chronically interrupted regenerations) prevents recurrence. Mass limits: according to official documentation.
by meccanic · rep 0
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