S11943 | Genuine Cummins® NOx Nitrogen Oxide Sensor

Description: A NOx (Nitrogen Oxide) sensor S11943 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: S11943 Condition: New Manufacture/Brand: Cummins Fits S11943 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 S11943: 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 S11943: 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.