21636091 | Genuine Volvo® NOx Nitrogen Oxide Sensor

Description: A NOx (Nitrogen Oxide) sensor 21636091 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. New NOx Nitrogen Oxide Sensor For Volvo/Mack D11/D13 MP7/8 Part Number: 21636091 Condition: New Manufacture/Brand: Volvo Fits 21636091 For Volvo/Mack D11/D13 MP7/8 Volvo trucks VNL VNM VHD Some VT applications Mack trucks CHU CXU GU LEU MRU CV Purpose of using 21636091: 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 Oxide Sensor 21636091: Check engine light (MIL) Poor fuel efficiency High DEF (AdBlue) consumption Failed emissions tests Error codes like P2201, P229F, P20EE, etc.   About the Manufacturer – Volvo: Volvo is a Swedish multinational company known for manufacturing premium commercial vehicles, including trucks, buses, and construction equipment. Founded in 1927, Volvo is recognized globally for its commitment to safety, innovation, and environmental sustainability. The brand focuses on producing reliable, fuel-efficient, and technologically advanced trucks that serve industries such as transportation, logistics, and construction. Volvo's dedication to quality and cutting-edge technology has made it a trusted name in the heavy-duty vehicle market worldwide.