The most important way of clearing the diagnostic trouble code P242F is by replacing defective or impaired parts in the vehicle's control modules. Clean the residue from the diesel particulate filter correctly. The power control modules replacement needs to be done. Check for unresponsive sensors, circuits, and wiring.

How many miles since oil and filter change ? If 6/7000 I would change them only refill oil to 1/8 inch below full mark as per Mazda instructions use Mazda oil only use high grade diesel try motorway run keeping revs 3000 plus should start a regen and keep it going then rely on regular oil changes check oil level by the stick each week.
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The DPF warning light will start flashing. If the engine fails to start, repeat the procedure from the beginning. Reg on demand could stop automatically if there are system failures as sensors. Regeneration is complete when the DPF warning light is no longer flashing: if it goes out, it means that the procedure has been completed successfully;
I was driving down road with live data and noticed its doing a trying a regen it gets upto 600c for around 5-10 mins it then goes to 0 miles from last regen trial and after around 35-45 tries the regen again . Is this telling me the dpf is knackered first car with a dpf . Many thanks
Remise à zéro ODB et/ou extinction voyant DPF Mazda 5 et 6. Salut à tous, Après avoir été quelque peu embêté par un voyant DPF clignotant (anti-pollution/FAP) sur une mazda 5, j'ai cherché sur le net une astuce pour l'éteindre sans passer par la case Mazda. Je suis donc tomber sur quelque tutos anglais pour la plupart et un traduit en
What Does Code P2459 Mean? OBD II fault code P2459 is a generic code that is defined as “Diesel Particulate Filter Regeneration Frequency”, and is set on diesel vehicles when the PCM (Powertrain Control Module) detects that the regeneration frequency of the DPF (Diesel Particulate Filter) is not conforming to a predefined and/or specified rate. bY7b07D. 199 877 31 67 617 922 333 258

mazda 3 dpf regeneration procedure