Description
PAI 050775 is an aftermarket nitrogen-oxide (NOx) sensor for 2013-2018 Cummins on-highway engines. The sensor mounts in the SCR aftertreatment system upstream and downstream of the DEF-dosed catalyst and reports NOx concentration to the engine ECU; degraded readings trigger SPN 3216/3226 fault codes, derate, and DEF dosing errors. Replaces Cummins 4326874, 4326874RX, and 2872946 with a direct-fit M20x1.5 thread, 4-pin connector, and 43.4″ cable lead.
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 050775 |
| Part Type | NOx Sensor (SCR aftertreatment) |
| Thread Size | M20x1.5 |
| Pin Count | 4 |
| Connector | Rectangular |
| Overall Length | 43.4″ cable |
| Engine Compatibility | Cummins ISX, ISL, ISB (2013-2018) |
Cross References
This NOx sensor replaces or is equivalent to the following part numbers:
- Cummins: 4326874, 4326874RX, 2872946
Applications
This NOx sensor fits the following engines:
- Cummins ISX15 (2013-2018)
- Cummins ISL9 (2013-2018)
- Cummins ISB6.7 (2013-2018)
Representative vehicles using these engines:
- Kenworth T660, T680, T800, W900, T370, T440 (2013-2018)
- Peterbilt 386, 388, 389, 579, 567, 337, 348 (2013-2018)
- International ProStar, LoneStar (2013-2018)
- Freightliner Cascadia, M2 (2013-2018, Cummins-equipped)
Verify upstream-vs-downstream sensor position and confirm the connector style on your existing harness before ordering. NOx sensors require a 30+ minute initial warm-up calibration after first key-on.
