DPF Differential Pressure Diagnostics

Pressure sensors, tubes, and false restriction readings

Master the pressure sensor, the tubes that feed it, and how blocked or melted tubes create false restriction codes.

1. 1.How the Differential Pressure Sensor Works
2. 2.Pressure Tubes & Reference Pressure
3. 3.Blocked, Melted & Cracked Tubes
4. 4.Sensor Bias & Zero-Flow Checks
5. 5.Wiring Problems on the Pressure Circuit
6. 6.Restricted DPF vs False Reading
7. 7.Diagnostic Scenario: Excessive Restriction