Walker 285-1126 Nitrogen Oxide (NOx) Sensor - Upstream

Walker Genuine OE NOx Sensor

Walker Genuine OE NOx Sensor Part Number 285-1126 is built for diesel and gasoline emission systems that rely on accurate nitrogen oxide monitoring. It is a direct-fit replacement for select Ram heavy-duty applications, including 2013-2018 Ram 2500 and 2013-2018 Ram 3500 upstream positions.

With OE-style connectors, harness length, and a square female connector design, this sensor is made for clean integration into the factory exhaust aftertreatment system. The silver housing, 4-terminal layout, and OE-level construction support dependable signal accuracy in demanding exhaust conditions.

Key Features

• Part Number 285-1126 for select upstream NOx sensor applications
• Fits 2013-2018 Ram 2500, upstream
• Fits 2013-2018 Ram 3500, upstream
• Square female connector with 4 terminals
• Silver sensor body
• OE connector and harness length for direct replacement
• Built for SCR aftertreatment systems and exhaust monitoring

Product Details

Walker Products Genuine OE NOx sensors are produced to meet the demands of modern emission control systems. This sensor measures nitrogen oxide levels in selective catalytic reduction systems so the engine control strategy can manage aftertreatment performance more accurately. Proper NOx feedback helps protect downstream components such as diesel particulate filters and supports efficient exhaust treatment on Ram 2500 and Ram 3500 diesel applications.

Part Number 285-1126 is engineered by Tier 1 OE suppliers using materials and manufacturing standards aligned with factory specifications. That makes it a practical choice for technicians and owners replacing a failed upstream sensor on 2013-2018 Ram 2500 or 2013-2018 Ram 3500 models.

What It Helps Address

• NOx sensor fault codes
• Incorrect exhaust emissions readings
• SCR system performance issues
• Aftertreatment warning lights
• Reduced diesel emission system efficiency

Installation Notes

Use the OE connector and harness routing as the reference during installation. Confirm the upstream sensor location before replacement, and inspect the exhaust connector, wiring, and surrounding heat shielding for damage or corrosion. Verify the application by year, make, model, and position before installation.

Quality Assurance

Walker Genuine OE sensors are produced to OE-level standards and field-tested for use in high-heat, high-vibration, and corrosive exhaust environments. This part cross-references no listed alternate part numbers for the same application.