Walker 285-1012 Nitrogen Oxide (NOx) Sensor - Downstream

OE-Style NOx Sensor Replacement

Walker Genuine OE NOx Sensor 285-1012 is a specific-fit emission sensor for diesel and gasoline aftertreatment systems. It is built for accurate nitrogen oxide monitoring in SCR-equipped applications and uses OE-style connectors and harness lengths for straightforward replacement.

Fits 2020-2022 Chevrolet Silverado 1500, downstream. Fits 2022 Chevrolet Silverado 1500 LTD, downstream. Fits 2020-2022 GMC Sierra 1500, downstream. Fits 2022 GMC Sierra 1500 Limited, downstream.

Key Features

• Genuine OE line from Walker for emission system service.
• Specific-fit design for direct replacement applications.
• Black matte housing with oblong connector shape.
• 6-terminal blade-pin connection with female connector and male terminals.
• Built for SCR system NOx measurement and exhaust environment durability.

Detailed Description

Part number 285-1012 is a Walker NOx sensor engineered to monitor nitrogen oxide levels so the aftertreatment system can manage emissions accurately. In SCR systems, precise NOx feedback supports proper operation of related components and helps maintain efficient engine performance. The Genuine OE line reflects Walker’s focus on OE-level materials, manufacturing standards, and plug-and-play serviceability.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• NOx sensor fault codes related to exhaust aftertreatment monitoring.
• Incorrect emissions feedback in SCR-equipped systems.
• Reduced emission-control performance from a failed sensor.
• Service issues caused by worn connectors or harness mismatch.
• Replacement needs for downstream sensor locations on supported trucks.

Installation Notes and Tips

Use the OE connector and harness layout to match the original sensor configuration before installation. Confirm downstream placement and connector style against the removed part, and inspect the exhaust-side wiring for heat or corrosion damage during service.

Quality Assurance

Walker Products states that this Genuine OE sensor is manufactured to OE-level standards and tested for demanding heat, vibration, and corrosive exhaust conditions.