NOx Sensor

Genuine OEM NOx Sensors

A failing NOx sensor can trigger an emissions fault code, force the SCR system into a derate, or cause the engine to over-inject DEF — all of which lead to failed inspections and unnecessary downtime. Because the NOx sensor feeds real-time nitrogen oxide data directly to the ECM, an inaccurate or failed reading can compromise the entire aftertreatment system. That's why every NOx sensor in this collection is genuine OEM, matched to the manufacturer's original part number.

What's in this category

This collection covers genuine OEM nitrogen oxide (NOx) sensors for heavy-duty diesel engines, including upstream and downstream sensors that monitor NOx levels before and after the SCR catalyst to verify emissions system performance.

Brands & engines we cover

This collection includes genuine OEM NOx sensors for Cummins (ISB, ISC, ISL 8.9L, and more), Volvo, and Mack (D11, D13, D16 engines) — and more, with new listings added regularly.

Why order your NOx sensor here

• Genuine OEM only — every sensor is matched to the manufacturer's original part number, not a generic equivalent
• Built for accurate fitment — listings include the exact OEM number and engine application so you can verify the right part before you buy
• Fast turnaround — ships quickly to keep your engine in emissions compliance

FAQ

Browse the full selection below, or search by OEM part number to find your exact match.