DPF Fault Codes Explained: Blockage, Sensors or ECU Logic?

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DPF Fault Codes Explained: Blockage, Sensors or ECU Logic?

DPF faults are commonly misdiagnosed. Many vehicles are flagged as “blocked” when the real issue lies elsewhere.

Typical causes include:

  • Failed differential pressure sensors

  • Exhaust temperature sensor errors

  • Incomplete regeneration logic

  • Driving pattern mismatches

  • Incorrect torque modelling

Replacing the DPF without addressing ECU logic or sensor input errors often leads to repeat failures.

In cases where the DPF is no longer serviceable or economically viable, DPF-off ECU calibration can:

  • Disable regeneration strategies

  • Remove back-pressure protection limits

  • Prevent limp mode

  • Restore reliability and MPG

🔥 DPF warning light or repeated regenerations?
We diagnose first, then apply the correct long-term solution, including ECU remapping where required.

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