Walker 285-1004 Nitrogen Oxide (NOx) Sensor - Upstream

OE NOx Sensor for Diesel Emissions

Walker Genuine OE NOx Sensor 285-1004 is a specific-fit emission control sensor for selective catalytic reduction systems. It measures nitrogen oxide levels accurately so the aftertreatment system can manage emissions and protect related components.

Key Features

• Genuine OE line built to OE supplier standards
• Specific-fit design with OE connectors and harness lengths
• Oblong female connector with 6-pin terminal layout
• Metallic finish with black connector housing
• Built for harsh exhaust heat, vibration, and corrosion

Detailed Description

This Walker NOx sensor is engineered for emission systems that rely on precise exhaust monitoring. Accurate NOx measurement supports SCR operation, helps maintain diesel particulate filter performance, and contributes to efficient engine operation. The 285-1004 is built as a plug-and-play replacement with OE-style electrical connection details for straightforward service.

Compatible With 2017-2019 Chevrolet Silverado 2500 HD, Upstream; 2017-2019 Chevrolet Silverado 3500 HD, Upstream; 2017-2019 GMC Sierra 2500 HD, Upstream; 2017-2019 GMC Sierra 3500 HD, Upstream. This part number, 285-1004, is the correct reference for these applications and is also identified by 285-1004 in catalog listings.

Walker Genuine OE is the brand line for OE-level emission components built around supplier-grade materials and manufacturing standards. For Chevrolet Silverado 2500 HD and GMC Sierra 3500 HD diesel emission service, this line focuses on fit, electrical compatibility, and dependable sensor output.

What It Helps Address

• Faulty NOx readings in the SCR system
• Emission warning lights tied to sensor failure
• Reduced aftertreatment efficiency from inaccurate exhaust data
• Stress on diesel particulate filter and related components
• Service issues caused by damaged OE-style connectors or harness fit

Installation Notes

Fits 2017-2019 Chevrolet Silverado 2500 HD, Upstream; 2017-2019 Chevrolet Silverado 3500 HD, Upstream; 2017-2019 GMC Sierra 2500 HD, Upstream; 2017-2019 GMC Sierra 3500 HD, Upstream. Verify connector shape, terminal count, and harness routing before installation. Use the OE connector and harness length match to confirm proper fitment for the intended application.

Quality Assurance

Walker Products states these Genuine OE NOx sensors are produced by Tier 1 OE suppliers using high-quality materials and precision manufacturing standards for demanding exhaust environments.