#regeneration
6 posts in Car Diagnostics blog about "regeneration" — OBD-II diagnostics, DTC codes, repair. ← All posts
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P242F: DPF restriction from ash accumulation — the filter that cannot be saved
Soot burns away during regeneration. Ash does not. This code is the point at which no amount of driving or forced regeneration will help.
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P2459: DPF regeneration frequency — the code that says you drive wrong
Not a component failure. The ECU has noticed the filter is regenerating far more often than it should, and that is usually about journeys rather than parts.
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DPF light on: the drive that clears it and the one that does not
The filter needs about twenty minutes of sustained motorway speed to burn off soot. Most people give it ten minutes of town driving and wonder why the light stays.
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P2002 and P2463: DPF efficiency below threshold and soot accumulation
One code says the filter is not filtering, the other says it is too full. Both usually trace back to regeneration that keeps starting and never finishes.
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Petrol particulate filters: why a GPF clogs in city traffic and what to do about it
Particulate filters have a reputation as a diesel problem. Since 2017 they have been fitted to direct-injection petrol cars too — and they clog the same way: short trips, city driving, an engine that never gets hot.
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DPF (Diesel Particulate Filter): diagnosing regeneration, clogging and when it's time for a clean
What a DPF is, how it regenerates, which DTCs signal a problem (P2002, P244A, P244B), how to read soot levels via OBD-II, and why short trips kill diesel engines.