Overview

PEX 193NOX2009 is a replacement nitrogen oxide (NOx) sensor for heavy-duty diesel exhaust aftertreatment systems. By monitoring NOx concentration in the exhaust stream, it provides the closed-loop feedback the engine control module needs to manage selective catalytic reduction (SCR) dosing and overall emissions strategy. As a PEX-branded aftermarket component, it is intended to integrate as an OE-style service part in applications originally equipped with an equivalent sensor.

Application & Interchange

This part is identified by distributors as a direct interchange for Continental 5WK96740B, with additional cross references published to Continental 5WK96740A/5WK96740C and Cummins 4326870/3687930. It is also commonly listed within Cummins NOx sensor product groupings, indicating use on selected Cummins-powered vehicles or equipment. Because public listings do not publish part-specific electrical or dimensional specifications for 193NOX2009, application verification should be based on the OE reference number and connector/interface match prior to installation.

Service Considerations

When replacing a failed NOx sensor, follow OEM procedures for harness routing and mounting, use specified torque, and complete required diagnostic steps (e.g., clear fault codes and perform aftertreatment/SCR resets where applicable). Confirm there are no upstream exhaust leaks that could distort readings. Using the correct interchange part helps restore accurate NOx measurement, clear warning indicators, and protect aftertreatment performance.