Cummins ISX15 Inlet NOx Sensor 12V 4326870 4326870RX 2872944

Advance Truck Parts Cummins ISX15 Inlet NOx Sensor 12V 4326870 4326870RX 2872944

Eliminate SCR derate warnings and active DEF fault codes with this Heavy-Duty Direct-Fit Inlet Nitrogen Oxide (NOx) Sensor (Part # 4326870 / 4326870RX). Engineered to meet strict OE specifications for high-accuracy exhaust gas monitoring on heavy-duty Cummins engine platforms.

A failing inlet NOx sensor leads to inaccurate DEF dosing, increased emissions, and impending ECM engine torque derates. This replacement sensor features pre-calibrated smart sensing logic and high-temperature thermal shielding to ensure accurate real-time feedback and reliable emissions compliance.

Key Product Features

• Plug-and-Play Installation: Factory-matched connector and mounting geometry eliminate wire splicing or harness modifications.
• Integrated Electronic Control Unit: Pre-calibrated internal microprocessor delivers instant, accurate communication with the engine ECM.
• High-Temperature Braided Shielding: Protects internal wiring against under-chassis road debris, oil contamination, and intense exhaust heat.
• Fixes Active SPN Codes: Resolves common Cummins inlet NOx sensor circuit, signal erratic, and communication fault codes (including SPN 3216 / FMI codes).

Specifications & Applications

OEM Cross-Reference & Superseded Part Numbers:

Replaces Cummins / OE: 4326870, 4326870RX, 2872944, 2872944RX, 4326870NX, 2872944NX, 5WK96740, 5WK96740A, 5WK96740B.

Common Signs of a Faulty Inlet NOx Sensor:

• Active Check Engine / DEF System Malfunction Lamp illuminated.
• ECM triggering vehicle speed or engine torque derate (5 MPH or 25% power cut).
• Excessive or erratic Diesel Exhaust Fluid (DEF) consumption.
• Diagnostic Trouble Codes: SPN 3216 (Inlet NOx sensor circuit or rationality errors).

Fast Shipping & Local Pickup: Orders placed before cut-off ship the same day. Free 1-hour warehouse pickup available in South Florida.