Walker 1004-1028 Nitrogen Oxide (NOx) Sensor - SCR Catalyst Inlet

Walker Genuine OE NOx Sensor 1004-1028

Walker Genuine OE NOx Sensor 1004-1028 is built for diesel and gasoline emission systems that rely on accurate nitrogen oxide monitoring. With OE-style connectors, a specific-fit design, and a 590.00 wiring harness length, it is made for direct replacement service on vehicles that use selective catalytic reduction (SCR) aftertreatment.

Key Features

• Genuine OE line sensor for emission control applications
• Specific-fit design with OE connector and harness length
• Black, matte finish with square connector shape
• 4-terminal female connector with male terminals
• Built for high-heat, vibration, and corrosive exhaust environments
• Part number 1004-1028 for catalog and service identification

Product Details

Walker Products Genuine OE NOx Sensors are produced by Tier 1 OE suppliers using materials and manufacturing standards aligned with original vehicle requirements. This sensor measures nitrogen oxide levels in the exhaust stream so the SCR system can manage aftertreatment performance, protect components such as diesel particulate filters, and maintain efficient engine operation. The 1004-1028 sensor is a direct replacement choice for service work on diesel and gasoline emission systems, including domestic and import applications such as Mercedes-Benz and Freightliner platforms where this OE reference is used.

The Genuine OE brand line focuses on OE-level fit and electrical connection details, which helps simplify replacement on vehicles that require a specific harness length and connector configuration. For buyers searching for a NOx sensor replacement for Mercedes-Benz or Freightliner diesel emission systems, 1004-1028 provides a cataloged OE-style solution with the correct connector geometry and wiring layout.

This part cross-references A0101531928 for the same application.

What It Helps Address

• NOx sensor fault codes related to exhaust emissions monitoring
• SCR system performance issues caused by inaccurate nitrogen oxide readings
• Aftertreatment inefficiency that can affect emissions control operation
• Potential stress on diesel particulate filter and related emission components
• Drivability concerns tied to emission system sensor failure

Installation Notes and Tips

Verify connector shape, terminal count, and harness length before installation. This is a specific-fit sensor, so OE connector alignment and routing should match the original layout. Inspect the exhaust-side mounting area for corrosion, soot buildup, or damaged wiring before installing the replacement sensor. Confirm the vehicle uses the correct NOx sensor location and reference number for the application.

Quality Assurance

Walker Products states that Genuine OE NOx Sensors are manufactured to OE-level standards by Tier 1 suppliers and field-tested for demanding exhaust conditions. The 1004-1028 part number is supported by Walker technical coverage and is built for dependable emission-system service.