The Cummins 4326872RX is a genuine OEM remanufactured Nitrogen Oxide (NOx) sensor designed for heavy-duty Cummins ISX and X15 aftertreatment systems. This sensor monitors exhaust gas NOx levels to ensure proper SCR function and emissions compliance.

A failing NOx sensor can trigger active fault codes, engine derate conditions, failed regeneration cycles, and reduced fuel efficiency. Replacing a faulty sensor promptly helps restore aftertreatment performance and prevent extended downtime.

This product includes a $289 refundable core charge. The original core must be returned in rebuildable condition within 30 days to receive a refund. Customer is responsible for return shipping unless otherwise arranged.