Pressure system
Differential pressure sensors, split rubber pipes, blocked metal pipes and wiring faults.
DPF repairs that target the cause.
Pressure sensor faults, damaged pipes, temperature issues and upstream engine problems can all make the DPF look like the problem when it is only the symptom.
Common repair areas
These faults often need attention before cleaning or regeneration will hold.
Temperature and regen
Exhaust temperature sensors, failed regen conditions, thermostat issues and incomplete adaptations.
Engine-side causes
EGR, boost leaks, injector faults, MAF readings, turbo control and oil contamination.
Had parts fitted already?
Let us know what has been changed and whether the warning returned immediately or after a few journeys. That history is useful diagnostic evidence.