Walker 285-1127 Nitrogen Oxide (NOx) Sensor - Upstream

Walker Genuine OE NOx Sensor for Ram Diesel Emissions

Walker Genuine OE Part Number 285-1127 is a nitrogen oxide sensor built for diesel and gasoline emission systems that rely on accurate exhaust monitoring. It is a direct-fit solution for 2019-2024 Ram 2500 and 2019-2024 Ram 3500 upstream applications, with OE-style connectors and harness length for straightforward replacement.

Key Features

• Genuine OE NOx sensor for selective catalytic reduction (SCR) aftertreatment systems
• Fits 2019-2024 Ram 2500, upstream
• Fits 2019-2024 Ram 3500, upstream
• OE connector and harness length for plug-and-play installation
• Built with Tier 1 OE supplier materials and manufacturing standards
• Black and gray matte housing with square female connector, 4 terminals, spade terminal type, and male terminals

Product Details

Walker Products Genuine OE line focuses on emission control components built to the same material and precision standards used by leading vehicle manufacturers. Part number 285-1127 measures nitrogen oxide levels in the exhaust stream so the SCR system can manage aftertreatment performance accurately. On Ram 2500 and Ram 3500 diesel applications, correct NOx feedback helps maintain emission-system operation, protect downstream components such as diesel particulate filters, and support consistent engine efficiency. This part cross-references Walker Products 285-1127 for the same application.

What This Sensor Helps Address

• Fault codes related to NOx sensor performance
• Incorrect exhaust emissions readings in SCR-equipped systems
• Aftertreatment issues affecting DPF protection and regeneration strategy
• Drivability concerns caused by inaccurate emission-system data
• Replacement needs for a failed upstream NOx sensor on Ram 2500 and Ram 3500 models

Installation Notes and Tips

Verify the upstream sensor location before installation and match the OE connector style, terminal layout, and harness routing to the original part. Inspect the exhaust-side mounting area for corrosion, soot buildup, or damaged wiring before connecting the new sensor. For 2019-2024 Ram 2500 and 2019-2024 Ram 3500 service, confirm the part number 285-1127 against the vehicle’s emission-system configuration before final installation.

Quality Assurance

Walker Genuine OE NOx sensors are produced by Tier 1 OE suppliers and built for demanding exhaust environments with heat, vibration, and corrosion exposure. The Walker 285-1127 is engineered for OE-level fit, form, and function in Ram emission-control service.