Walker 250-54127 Oxygen Sensor - Upstream

Walker Products OE Oxygen Sensor for Nissan and INFINITI

Walker Products OE Part Number 250-54127 is an oxygen sensor engineered as an OE-style replacement for specific Nissan and INFINITI applications. It is built for the correct application and mounting position so the ECU receives the diagnostic feedback it expects.

Compatible With 2019-2025 Nissan Altima upstream applications, 2020-2024 Nissan TITAN upstream right applications, and select Pathfinder, Murano, Armada, Maxima, QX50, QX55, QX60, QX80, and INFINITI QX60/QX80 applications.

Key Features

• Walker Products OE line replacement oxygen sensor
• Application-specific fitment for listed Nissan and INFINITI vehicles
• Designed for the correct sensor location and ECU feedback
• Supports upstream and upstream rear positions where listed
• Built for emissions control and engine management service
• Part number 250-54127 for accurate catalog matching

Product Details

Walker Products OE focuses on direct-replacement engine management sensors for vehicles worldwide. Part number 250-54127 is intended for the exact application and position shown in the fitment data, helping restore proper oxygen-sensor signal input to the engine control unit. For vehicles such as the Nissan Altima, Pathfinder, Murano, TITAN, and INFINITI QX60, QX80, QX50, and QX55, the sensor supports emissions monitoring and fuel-control feedback at the upstream or upstream rear location specified by the vehicle.

This part cross-references no additional part numbers in the provided data.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect air-fuel feedback
• Rough engine operation from inaccurate sensor readings
• Elevated exhaust emissions from a failing sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes

Verify the exact year, make, model, and sensor position before ordering. Inspect the sensor wiring harness and connector for damage during diagnosis, since physical damage can shorten service life and affect operation. Confirm the upstream, upstream rear, or upstream right location matches the vehicle listing before installation.

Quality Assurance

Walker Products states that its engine management and oxygen/air-fuel sensors are developed as OE replacement parts and manufactured for the specified application and fitment position. The company is ISO 9001/TS 16949 certified and has supplied engine management and fuel system components since 1946.