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Cummins  |  SKU: 2894943

2894943 | Genuine Cummins® NOx Nitrogen Oxide Sensor

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Description:
A NOx (Nitrogen Oxide) sensor 2894943 is an electronic device used in internal combustion engines (especially diesel engines) to detect and measure the concentration of nitrogen oxides (NO and NO₂) in the exhaust gases. These pollutants are harmful to human health and the environment, so monitoring and controlling them is crucial for meeting emissions regulations. NOx Nitrogen Oxide Sensor For Cummins ISB 6.7L, ISX 11.9L and ISX 15L engine configurations

Part Number: 2894943
Condition: New
Manufacture/Brand: Cummins

Fits 2894943 For Cummins ISB 6.7L, ISX 11.9L and ISX 15L engine configurations

Manufacturer Models Approx. years
Blue Bird All American FE, All American RE, Vision 2010–2015
Capacity TJ5000, TJ6500, TJ7000, TJ9000 2011–2015
Freightliner B2, Cascadia, M2 106, MT45, MT55, 108SD, Columbia, Coronado 2010–2015
International LoneStar, ProStar 2010–2015
Kenworth C500, T660, T680, T700, T800, T880, W900 roughly 2010–2015+ depending on application
Peterbilt 320, 365, 367, 384, 386, 388, 389, 587 2010–2015
Volvo VNL 2010–2015
Western Star 4900SA, 4900EX, 4900FA 2010–2015
Spartan Motors K3 2012–2015
Gillig Low Floor 2010–2014



Purpose of using 2894943:

1. Emissions Control

Measures NOx levels in the exhaust to ensure they stay within legal limits (EPA, Euro 6, etc.)
Helps reduce harmful pollutants that contribute to:
Air pollution
Smog
Acid rain
Respiratory and cardiovascular problems

2. Enables SCR (Selective Catalytic Reduction) System

SCR uses Diesel Exhaust Fluid (DEF/AdBlue) to convert NOx into harmless nitrogen (N₂) and water (H₂O).
The NOx sensor provides feedback to control how much DEF to inject.
Ensures proper dosing to avoid:
Overuse (wasting DEF)
Underuse (failing emissions requirements)

3. Engine Performance Optimization

Works with the ECU (Engine Control Unit) to adjust:
Air-fuel ratio
Exhaust gas recirculation (EGR)
Combustion timing
Helps balance fuel economy, power, and emissions

4. Diagnostic and Safety Functions

Detects when emissions systems (like SCR or DPF) are failing or underperforming
Triggers check engine lights, fault codes, or limp mode if NOx levels exceed safe limits
Required for onboard diagnostics (OBD) compliance


Signs of a Bad NOx Nitrogen Oixide Sensor 2894943:

  • Check engine light (MIL)

  • Poor fuel efficiency

  • High DEF (AdBlue) consumption

  • Failed emissions tests

  • Error codes like P2201, P229F, P20EE, etc.


About the Manufacturer – Cummins:

Cummins is a leading American manufacturer of diesel and natural gas engines, as well as power generation systems and emissions solutions. Founded in 1919 and headquartered in Columbus, Indiana, Cummins is known globally for its durable, high-performance engines used in trucks, buses, construction equipment, agriculture, and power systems.

The brand is widely respected for its innovation in clean diesel technology, including aftertreatment systems, turbochargers, and advanced electronics that help reduce emissions while maximizing engine efficiency and reliability.

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