Walker 285-1001 Nitrogen Oxide (NOx) Sensor - Upstream

Walker Genuine OE NOx Sensor 285-1001

Walker Genuine OE NOx Sensor 285-1001 is built for diesel and gasoline emission systems that rely on accurate nitrogen oxide monitoring. It uses OE-style connectors, a gray oblong female/male connector layout, and a 5-terminal design for direct replacement service.

Fits 2017-2019 Ford F-250 Super Duty, upstream. Fits 2017-2019 Ford F-350 Super Duty, upstream. Fits 2020 Ford F-250 Super Duty, upstream, NOX Trap; Genuine OE.

Key Features

• Genuine OE line sensor for emission control service
• Part number 285-1001 for direct lookup and ordering
• Upstream NOx sensor for SCR system monitoring
• OE connectors and harness lengths for plug-and-play replacement
• Gray finish with gray connector color and oblong connector shape
• 5-terminal configuration with female and male connector interfaces
• Built for heat, vibration, and corrosive exhaust conditions

Detailed Description

Walker Products Genuine OE NOx sensors are produced by Tier 1 OE suppliers using the same material standards and precision manufacturing expected in modern emission systems. This sensor measures nitrogen oxide levels in selective catalytic reduction (SCR) aftertreatment systems, helping the vehicle control module manage exhaust treatment and protect components such as diesel particulate filters. On Ford Super Duty diesel applications, accurate upstream NOx readings are critical for stable aftertreatment performance and efficient engine operation. Walker 285-1001 is a direct-fit replacement for service on 2017-2019 Ford F-250 Super Duty, 2017-2019 Ford F-350 Super Duty, and 2020 Ford F-250 Super Duty applications listed above.

The Genuine OE product line focuses on OE-level fit, connector design, and sensor performance for domestic and import vehicles. Walker 285-1001 follows that approach with a service-ready design that matches OE connector and harness requirements for cleaner installation and reliable signal output.

Common Issues This Sensor Can Address

• Check engine light related to NOx sensor performance
• Fault codes tied to SCR system monitoring
• Incorrect upstream NOx readings in diesel aftertreatment systems
• Reduced emission system efficiency from a failed sensor
• Service concerns involving Ford F-250 Super Duty or Ford F-350 Super Duty upstream NOx monitoring

Installation Notes and Tips

Verify the connector shape, terminal count, and upstream location before installation. Match the vehicle application exactly, especially on 2020 Ford F-250 Super Duty models with NOX Trap; Genuine OE notes. Inspect the harness routing and exhaust-side mounting area for heat damage, corrosion, or contamination before connecting the new sensor. Clear diagnostic trouble codes after installation and confirm the SCR system completes its relearn or readiness checks.

Quality Assurance

Walker Genuine OE NOx sensors are manufactured to OE supplier standards and field-tested for demanding exhaust environments. Part number 285-1001 is built for direct replacement service with OE-style fit and electrical connection consistency.