Description
Genuine Detroit Diesel / Mercedes-Benz A4721530728 OEM differential pressure sensor for DD13 and DD15 aftertreatment circuits. The sensor monitors the pressure delta across the DPF (or EGR cooler, depending on application) to drive active-regen scheduling and EGR flow validation in the engine ACM and CPC. A failing sensor commonly causes false-regen, failed-regen, derate, and aftertreatment fault codes on Cascadia and other Daimler trucks.
Signs You Need a New Differential Pressure Sensor
- Active fault codes for differential pressure sensor signal rationality, out-of-range, or circuit failure
- DPF regeneration cycles trigger too frequently or fail to complete without confirmed soot loading
- 5 mph derate paired with aftertreatment fault codes and a normal manually-measured soot load
- Differential pressure reads zero or maximum at idle and under load
Specifications
| Manufacturer | Detroit Diesel / Mercedes-Benz — Genuine OEM |
|---|---|
| Part Number | A4721530728 (DDE A4721530728) |
| Part Type | Differential Pressure Sensor (DPF / EGR) |
| Input Voltage | 4.75 – 5.25 VDC reference |
| Engine Compatibility | Detroit DD13, DD15 (EPA10 / GHG14) |
Cross References
This sensor replaces or is equivalent to the following part numbers:
- Detroit Diesel: A4721530728, DDE A4721530728, 4721530728
- Mercedes-Benz: A 472 153 07 28
Applications
This sensor fits the following Detroit Diesel engines:
- Detroit Diesel DD13 12.8L (EPA10 / GHG14 on-highway)
- Detroit Diesel DD15 14.8L (EPA10 / GHG14 on-highway)
Representative vehicles using these engines:
- Freightliner Cascadia and Cascadia Evolution (2010 – present)
- Freightliner M2 112 / Coronado / Argosy with DD13
- Western Star 4900 / 5700XE / 4700 with Detroit DD13 or DD15
Confirm your engine serial number, aftertreatment assembly part number, and the sensor circuit (EGR cooler vs DPF differential) before ordering. Detroit aftertreatment uses multiple A472xxx-series sensors with similar form factors — verify the exact sensor called for in your fault tree.
