High DPF Differential Pressure
Diagnostics show the pressure drop across the filter is high — the direct measurement of restriction. It's the most honest DPF number there is, provided the sensor and hoses are telling the truth.
What commonly causes it
- ·Genuine soot/ash restriction
- ·Sensor or hose faults reading falsely high
- ·Melted/collapsed substrate after overheating or a botched forced regen
Test this before blaming the DPF
- ·Verify the sensor: static zero reading, hose condition, connector
- ·Compare idle and loaded readings — a blocked filter shows a characteristic rise under load
- ·Rule out recent forced-regen damage if readings jumped suddenly
Will cleaning fix it?
For soot/ash restriction with an intact core, cleaning restores flow and we prove it — every unit leaves with measured before/after pressure and flow figures, so you see exactly what the clean recovered.
Engines this disproportionately affects
Check your vehicle & get a quote
Enter your registration — we'll identify the exact unit and give you the correct recommendation for this fault.
Vehicle data from the DVSA MOT history service. We confirm the exact unit on inspection. Privacy
Test evidence
Every unit is flow- and pressure-tested before and after cleaning. You get the readings, photo evidence and a completion certificate with the unit — proof for you and your customer, not marketing numbers.