Walker 250-54126 Oxygen Sensor - Upstream

OE Oxygen Sensor for Nissan Altima

Walker Products OE 250-54126 is an upstream oxygen sensor engineered as an original-equipment-style replacement for specific Nissan Altima applications. It is built for the correct fitment position and ECU feedback expected by the vehicle’s engine management system.

For 2016-2018 Nissan Altima models with Federal Emissions, this upstream sensor supports accurate exhaust monitoring at Bank 1 Sensor 1. If the original sensor is failing, the vehicle may run poorly, use more fuel, or trigger the malfunction indicator light.

Key Features

• Walker Products OE oxygen sensor for upstream placement
• Designed for 2016-2018 Nissan Altima applications listed below
• Bank 1 Sensor 1 fitment for the correct exhaust monitoring location
• Supports ECU feedback for emissions and fuel-control strategy
• Walker Products OE line focuses on application-specific replacement parts
• Part number: 250-54126

Product Details

Walker Products OE 250-54126 is part of the Walker Products OE line, which centers on direct-replacement engine management components built for specific vehicle applications and sensor positions. This oxygen sensor is intended for the upstream location on the Nissan Altima and is listed for Federal Emissions configurations. The part number 250-54126 is associated with the correct diagnostic feedback needed by the ECU when replacing a worn or failed sensor.

Fits 2018 Nissan Altima, upstream. Fits 2016-2017 Nissan Altima, upstream. This part cross-references no additional part numbers in the provided data.

Common Issues This Sensor May Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by inaccurate exhaust readings
• Increased fuel consumption from incorrect air-fuel feedback
• Higher exhaust emissions from a degraded upstream sensor
• Stored ECU fault codes tied to Bank 1 Sensor 1

Installation Notes and Tips

Verify the sensor location before installation: this part is for the upstream position on the listed Nissan Altima applications. Inspect the sensor, wiring harness, and connector for physical damage before replacement, since damaged wiring can shorten sensor life and affect operation. Confirm Federal Emissions fitment and match the vehicle’s ECU fault code to the affected sensor location.

Quality Assurance

Walker Products is an Automotive ISO9001/TS 16949 certified company with a long history in engine management and fuel system components. The OE product line is developed for application-specific replacement use and correct diagnostic system feedback.