Walker 1004-1031 Nitrogen Oxide (NOx) Sensor - SCR Catalyst Outlet

Walker Genuine OE NOx Sensor 1004-1031

Walker Genuine OE Nitrogen Oxide (NOx) Sensor 1004-1031 is built for diesel and gasoline emission systems that rely on accurate exhaust monitoring. It uses OE-style connectors, a specific-fit design, and a 730.00 wiring harness length for direct replacement service on select applications.

For drivers and technicians servicing SCR-equipped vehicles, this Walker NOx sensor helps maintain precise emissions feedback for aftertreatment control. It is a practical replacement for select Mercedes-Benz and other import applications where OE-level connector fit and harness routing matter.

Key Features

• Part number 1004-1031 Walker Genuine OE NOx sensor
• Specific-fit replacement with OE connector and harness layout
• Square, white female connector with 5 male terminals
• Gray matte finish for underbody exhaust environments
• 730.00 wiring harness length for application-specific routing
• Built for selective catalytic reduction (SCR) emission systems
• Paraphrased OE supplier construction for consistent sensor performance

Product Details

Walker Products Genuine OE NOx sensors are produced to meet the demands of modern emission control systems. This sensor monitors nitrogen oxide levels in the exhaust stream so the vehicle’s aftertreatment system can manage emissions accurately and protect components such as diesel particulate filters. The Genuine OE line focuses on OE-style materials, connector design, and fitment consistency for direct replacement service. Part number 1004-1031 is a specific-fit sensor for select domestic and import diesel and gasoline applications, including Mercedes-Benz coverage where listed by catalog fitment.

This part cross-references A0101532328 for the same application.

Common Problems This Sensor Can Address

• NOx sensor fault codes related to SCR system monitoring
• Incorrect exhaust emissions readings from a failed sensor
• Check engine lights tied to aftertreatment performance
• Reduced diesel particulate filter protection from inaccurate NOx data
• Harness or connector mismatch during direct replacement service

Installation Notes

Confirm the connector shape, terminal count, and harness length before installation. This is a specific-fit sensor, so compare the vehicle connector and routing to the original unit before replacement. For Mercedes-Benz and other listed applications, verify the OE part number and sensor location against the vehicle’s emission system layout. Follow factory service procedures for exhaust sensor removal and installation.

Quality Assurance

Walker Genuine OE NOx sensors are manufactured by Tier 1 OE suppliers using the same type of materials and precision standards used in original vehicle production. The design is field-proven for heat, vibration, and corrosive exhaust exposure in SCR-equipped systems.