Walker 1004-1033 Nitrogen Oxide (NOx) Sensor - Upstream

Walker Genuine OE NOx Sensor 1004-1033

Walker Genuine OE NOx Sensor Part Number 1004-1033 is built for diesel and gasoline emission systems that rely on accurate nitrogen oxide monitoring. With a specific-fit design, OE-style connector geometry, and a 4-terminal square female connector, it is made for direct replacement in emission control service.

Walker Products sources this Genuine OE line through Tier 1 OE suppliers, using the same material and manufacturing standards found in original vehicle applications. The result is a sensor built for SCR aftertreatment systems where precise NOx readings help maintain exhaust system performance and protect downstream components.

Key Features

• Part Number 1004-1033 for emission control sensor replacement
• Genuine OE line from Walker Products
• Specific-fit NOx sensor with OE connector and harness-length matching
• Black matte housing with gray square female connector
• 4-terminal design with male terminals
• Built for harsh exhaust environments with heat, vibration, and corrosion exposure
• Used in SCR systems for accurate nitrogen oxide measurement

Product Details

This Walker NOx sensor is engineered for vehicles that depend on precise exhaust aftertreatment feedback. In applications such as Ford F-250 Super Duty, Ford F-350 Super Duty, and Ram 2500 diesel service, accurate NOx data helps the control system manage emissions and maintain proper SCR operation. Part Number 1004-1033 is also referenced by 2236118, 2265455, 2347656PE, and AAA21038900 for the same application.

Walker Genuine OE sensors are built to deliver OE-level fit and electrical connection quality, making them a practical choice when replacing a failed sensor or servicing an emission system before drivability or emissions faults spread to other components.

What It Helps Address

• NOx sensor fault codes
• SCR system performance issues
• Incorrect nitrogen oxide readings
• Emission warning lights related to aftertreatment monitoring
• Downstream stress on diesel particulate filter and related exhaust components

Installation Notes

Use the vehicle’s original connector style and harness routing as the reference during replacement. Confirm the connector shape, terminal count, and specific-fit application before installation. For fitment-based searches, this part is commonly sought for 2011-2016 Ford F-250 Super Duty, 2011-2016 Ford F-350 Super Duty, and 2013-2018 Ram 2500 diesel applications. Part Number 1004-1033 should be matched to the exact OE cross-reference and vehicle calibration requirements before service.

Quality Assurance

Walker Products positions the Genuine OE line as OE-supplier manufactured, with production standards aligned to original equipment requirements for fit, materials, and sensor performance. The sensor is field-tested for demanding exhaust conditions and built for dependable operation in emission control service.