Walker 285-1003 Nitrogen Oxide (NOx) Sensor - Downstream

Overview

Walker Genuine OE NOx Sensor 285-1003 is a specific-fit emission sensor for diesel aftertreatment systems. It is built for accurate nitrogen oxide monitoring in SCR-equipped applications and uses OE-style connectors and harness lengths for a direct replacement experience.

Compatible with Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD applications listed below, this sensor supports proper emissions control and system efficiency. Part number 285-1003 is also identified as a Genuine OE replacement from Walker.

Key Features

• Specific-fit NOx sensor for emission control systems
• OE-style connector and harness length for plug-and-play installation
• Built with Tier 1 OE supplier manufacturing standards
• Designed for SCR system monitoring and accurate NOx measurement
• Gray connector, oblong shape, female connector with 6-pin terminal layout
• Matte finish with multi-colored sensor construction

Detailed Description

Walker Products Genuine OE NOx Sensor 285-1003 is engineered for downstream emission monitoring in SCR systems. Accurate NOx measurement helps the aftertreatment system manage emissions correctly, protect components such as diesel particulate filters, and maintain efficient engine operation. The Genuine OE line focuses on OE-level materials, precision manufacturing, and fitment consistency for service replacement work.

This part fits 2017-2019 Chevrolet Silverado 2500 HD, downstream; 2017-2019 Chevrolet Silverado 3500 HD, downstream; 2017-2019 GMC Sierra 2500 HD, downstream; and 2017-2019 GMC Sierra 3500 HD, downstream. Part number 285-1003 is a direct reference for ordering and catalog matching.

What It Helps Address

• Fault codes related to NOx sensor performance
• Incorrect nitrogen oxide readings in the exhaust stream
• SCR system monitoring issues
• Emission control problems that can affect DPF protection
• Reduced efficiency from a failing downstream sensor

Installation Notes

Use the vehicle-specific connector and harness layout to match the original sensor configuration. Confirm downstream placement and connector style before installation. Because this is a specific-fit sensor, verify the application by year, make, model, and position before ordering.

Quality Assurance

Walker states that the Genuine OE line is produced by Tier 1 OE suppliers using the same materials, standards, and precision technology associated with leading vehicle manufacturers. The sensor is built for demanding exhaust environments with heat, vibration, and corrosion exposure.