Diesel particulate filter
The diesel particulate filter: the differential pressure sensor, regeneration and soot overload. Half the codes in this group are not about hardware but about the driving pattern: the filter cleans itself, but only with a warm exhaust and at speed.
6 codes in this section, 6 with a guide
What it usually turns out to be
- Regeneration never finishes — most often because the trips are short: an hour on the motorway does more than replacing parts.
- Regeneration running too often means more soot than normal is being made: look for the cause in the engine, not in the filter.
- A pinched or cracked pressure pipe produces the same codes as a dead sensor.
P2453DPF differential pressure sensor — malfunctionguideP2454DPF differential pressure sensor — low signalguideP2455DPF differential pressure sensor — high signalguideP2458DPF regeneration duration faultguideP2459DPF regeneration frequency faultguideP2463DPF — excessive soot accumulationguide
Read about this group
Other sections
Fuel and air metering, general 33Intake measuring sensors 17Oxygen sensors 19Throttle and accelerator pedal 15Mixture: lean and rich 11Fuel and air metering: injectors 25Ignition system and misfires 29Exhaust gas recirculation (EGR) 7Secondary air injection 3Catalytic converter 4Canister and purge valves 9Fuel vapour leaks 7Fuel level in the tank 4Idle and auxiliary systems 22Control module and its circuits 21Transmission 17Communication between modules 20Brakes, ABS and stability control 17Body, airbags and lighting 12