Product Overview
Cummins 4326870 2872944 3687930 Inlet NOx Sensor by Nernex
The Nernex 20.220321 NOx Sensor is a direct-fit aftermarket inlet NOx sensor for applications using Cummins 4326870, 2872944, and 3687930. Designed for compatible EPA10 Cummins ISX12 and ISX15 exhaust aftertreatment systems, this upstream NOx sensor measures exhaust NOx before SCR treatment and provides the vehicle control system with data used to manage DEF dosing and SCR emissions performance.
Cummins 4326870 2872944 3687930 NOx Sensor Cross References
| Manufacturer / Brand | Cross Reference |
|---|---|
| Cummins | 4326870, 4326870NX, 4326870RX |
| Cummins | 2872944, 2872944NX, 2872944RX |
| Cummins | 3687930, 3687930NX, 3687930RX |
| Continental / VDO | 5WK96740B, 5WK9 6740B |
| Continental / VDO | 5WK96740A, 5WK9 6740A |
| Continental / VDO | A2C95990700-01, A2C9599070001, A2C95990700 |
| Continental / VDO | SNS140B |
| Dorman | 904-6009 |
| Automann | 577.90652 |
| Denso | 170-1002 |
| FSS Emission Products | 26870-FSS |
| Skyline | SNX001 |
| Skyline | ANX001 |
| Global Emission Systems / DPFXFIT | SENN-0022XF |
| Dinex | 5EL012 |
| Nernex | 20.220321 |
Nernex Inlet NOx Sensor Technology
Nernex aftermarket NOx sensors are designed for the precise exhaust-gas measurement required by modern diesel aftertreatment systems. The sensor electronics communicate NOx concentration data to the vehicle control system to support accurate DEF dosing, Selective Catalytic Reduction (SCR), and continuous emissions-system monitoring.
The Nernex 20.220321 is installed in the inlet / upstream / pre-SCR position. At this location, the sensor measures NOx concentration before SCR treatment, allowing the vehicle control system to calculate appropriate DEF dosing and monitor aftertreatment performance.
Nernex 20.220321 NOx Sensor Specifications
| Manufacturer | Nernex |
| Part Number | 20.220321 |
| Product Type | Aftermarket NOx Sensor |
| Sensor Position | Inlet / Upstream / Pre-SCR |
| Voltage | 12 Volt |
| Connector | 4 Pin |
| Emissions Application | EPA10 |
| System Function | Pre-SCR NOx measurement, DEF dosing support and SCR monitoring |
| Warranty | 1 Year / Unlimited Miles |
| California Availability | Available for sale and shipment to California |
Cummins ISX12 11.9L and ISX15 14.9L Applications
The Nernex 20.220321 inlet NOx sensor is designed for compatible commercial vehicles using Cummins ISX engines and the matching EPA10 exhaust aftertreatment system.
Compatible Cummins Engines: ISX12 / ISX 11.9L and ISX15 / ISX 14.9L
Kenworth Peterbilt International and Freightliner Applications
Kenworth: T680, T800, T880 and other compatible Cummins ISX configurations
Peterbilt: 367, 389, 567, 579 and other compatible Cummins ISX configurations
International: ProStar, LoneStar, MV625, LT625 and other compatible Cummins-powered applications
Freightliner: Cascadia, Coronado, Columbia and other compatible Cummins ISX-powered applications
Sensor Position: Inlet / Upstream / Pre-SCR
Primary OEM Application Numbers: 4326870, 2872944, 3687930
Direct-Fit Replacement for Cummins 4326870 2872944 3687930
The Nernex 20.220321 is intended as a direct-fit aftermarket replacement for compatible applications using 4326870, 2872944, or 3687930. Related Cummins NX and RX service numbers are also listed above to assist with part-number identification.
Because the same truck model can use different NOx sensors depending on engine, model year, emissions calibration, and sensor position, always compare the original stamped OEM or Continental/VDO number before ordering. Confirm that the original sensor is located in the inlet / upstream / pre-SCR position and that the connector and application match.
Product images are for reference only. Always verify the original sensor/OEM number, sensor location, engine application, and connector configuration before installation.
California Proposition 65 Warning: WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer or reproductive harm. For more information go to www.P65Warnings.ca.gov.
