Walker 1004-1077 Nitrogen Oxide (NOx) Sensor - SCR Catalyst Outlet

Walker Genuine OE NOx Sensor 1004-1077

Walker Genuine OE NOx Sensor 1004-1077 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 black gloss finish with a gray oblong connector, this sensor is made for direct replacement service in demanding exhaust environments.

Walker Products Genuine OE line focuses on OE-level fit and electrical connection details for emission control repairs. Part number 1004-1077 is engineered by Tier 1 OE suppliers and built for SCR aftertreatment systems where precise NOx measurement helps maintain proper exhaust management on vehicles such as Ford F-250 and Ford F-350 applications.

Key Features

• Specific-fit NOx sensor for emission control service
• OE connector and harness-length style for direct replacement
• 6-terminal design with female connector and male terminals
• Black sensor body with gloss finish and gray oblong connector
• Built for high-heat, vibration, and corrosive exhaust conditions
• Supports SCR system monitoring on diesel and gasoline applications

Detailed Description

Walker 1004-1077 is a Genuine OE nitrogen oxide sensor designed to measure exhaust NOx levels accurately so the vehicle’s aftertreatment system can manage emissions correctly. In SCR-equipped systems, that measurement helps protect downstream components such as diesel particulate filters and supports long-term engine efficiency. This part cross-references 7503569C1 for the same application.

For buyers searching for a Ford F-250 NOx sensor replacement or a Ford F-350 emission sensor with OE-style fitment, this part number 1004-1077 provides a direct-service solution with the connector shape, terminal layout, and specific-fit construction needed for clean installation. Walker 1004-1077 is also a practical choice for fleet maintenance where consistent sensor response matters.

Common Problems It Can Address

• Fault codes related to NOx sensor performance
• Incorrect exhaust emissions readings in SCR systems
• Aftertreatment system inefficiency caused by sensor drift
• Reduced diesel particulate filter protection from poor NOx data
• Connector or harness mismatch during sensor replacement

Installation Notes and Tips

Verify the connector shape, terminal count, and harness routing before installation. This is a specific-fit sensor, so confirm the application by part number and vehicle configuration rather than relying on universal fit assumptions. For Ford F-250 and Ford F-350 service, compare the original sensor connector and mounting location to the replacement unit before final installation.

Quality Assurance

Walker Products builds its Genuine OE NOx sensors to OE supplier standards using materials and manufacturing controls aligned with modern emission-system requirements. The 1004-1077 part number is field-tested for use in harsh exhaust environments and produced for dependable electrical and sensor performance.