Walker Products’ NOx Sensors are OE Tier 1 produced, ensuring exact OE performance, fitment, and reliability across all applications. Designed for precision and built to the same rigorous standards as the sensors installed at the factory, our NOx solutions support accurate SCR system functionality—crucial for meeting Euro 6 and other global emissions standards. Each sensor undergoes advanced in-house validation for signal accuracy and durability, helping reduce DEF consumption and maintain engine efficiency. With broad vehicle coverage and plug-and-play compatibility, Walker delivers trusted quality that installers can rely on right out of the box.