DPF Pressure Sensor

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📖 YOUCANIC Automotive Glossary

The DPF Pressure Sensor measures the pressure differential across the diesel particulate filter by sampling exhaust pressure at the filter inlet and outlet through two small hoses. As soot accumulates, backpressure increases, raising the differential. The ECU uses this data combined with engine conditions to calculate soot loading percentage and determine when regeneration is needed. Normal differential is low on a clean DPF and rises as soot accumulates.

Common failures: moisture in sensor hoses (especially winter freezing), clogged hoses from soot, and sensor element degradation. DTCs: P2452-P2455. False readings cause either missed regeneration (actual soot higher than indicated) or unnecessary regen (soot lower than indicated). The YOUCANIC UCAN-II displays differential pressure alongside soot loading.

Synonyms:
DPF Differential Pressure Sensor, Delta-P Sensor, Exhaust Backpressure Sensor
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