Description
The PAI 730386 (also marketed as 730386E) is a 0–85 PSIG air pressure sensor that replaces Kenworth/Peterbilt/Paccar OEM Q21-1040 on the truck air system. Three-pin Packard-style connector, threaded sensor port; used to feed dash gauges or the body controller with primary/secondary tank pressure data on Kenworth and Peterbilt heavy trucks. Manufactured by PAI Industries in the USA.
Signs You Need a New Air Pressure Sensor
- Air pressure gauge reads erratically or stays at zero with the system charged
- “Low Air” warning lamp or buzzer with normal tank pressure on a manual gauge
- Diagnostic codes for air-system pressure-sensor circuit (open / short / out of range)
- Visible cracks, corrosion, or moisture intrusion at the connector
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 730386 (also 730386E) |
| Part Type | Air Pressure Sensor |
| Pressure Range | 0–85 PSIG |
| Connector | 3-Pin |
| Overall Length | ~2.628 in |
| Body OD | ~0.900 in |
| Country of Origin | United States |
Cross References
This sensor replaces or is equivalent to the following part numbers:
- Paccar (Kenworth / Peterbilt): Q21-1040, Q211040
- PAI: 730386, 730386E, KWP730386, KWP730386E
- Automann: 577.59514OE
- Also known as: SS5055
Applications
This air pressure sensor fits Kenworth and Peterbilt trucks built with the Paccar Q21-1040 sensor in the air-system dash or body-controller circuit. Representative vehicles:
- Kenworth T660, T680, T800, T880, W900, C500
- Peterbilt 386, 388, 389, 567, 579, 587
- Paccar-engined Kenworth and Peterbilt trucks 2007–current
Verify the existing sensor is the 0–85 PSIG variant (Q21-1040) and not the higher-range Q21-1041 before ordering. Always relieve air system pressure before removal.
