Walker 250-54133 Oxygen Sensor - Upstream

Walker OE Base Sensor 250-54133

Walker 250-54133 is a specific-fit heated wide-band oxygen sensor built for upstream placement and OE-style diagnostic feedback. It is engineered for select Nissan Altima and INFINITI QX50 and QX55 applications where accurate air-fuel monitoring is required by the ECU.

The Walker OE Base Sensor line focuses on application-specific fitment and sensor output for modern engine management systems. For shoppers searching for an upstream oxygen sensor for 2022-2024 Nissan Altima or a wide-band O2 sensor for 2023-2025 INFINITI QX50 and QX55, this part number is matched to the listed vehicle and position.

Key Features

• Heated wide-band oxygen sensor for upstream use
• Specific-fit design for the listed vehicle applications
• 4-wire, 4-terminal configuration
• Rectangle female connector with male terminals
• M18 x 1.5 thread size and 22 mm wrench size
• Supports ECU feedback for air-fuel ratio monitoring

Detailed Description

Walker Products develops engine management sensors as OE replacement parts for a wide range of vehicles. Part number 250-54133 is part of the OE Base Sensor line and is built for the exact application, fitment position, and diagnostic response expected by the vehicle control system. This makes it a direct choice for drivers and technicians replacing an upstream oxygen sensor on the 2022-2024 Nissan Altima or the 2023-2025 INFINITI QX50 and QX55.

Because this is a wide-band sensor, it is used where precise exhaust feedback is needed to help the ECU manage fuel delivery and emissions control. The sensor’s heated design helps it reach operating temperature quickly, while the specific connector and thread specifications support correct installation on the intended platform. Part number 250-54133 is also a useful reference when searching for Walker 250-54133 oxygen sensor replacement options.

What It May Help Resolve

• Check engine or malfunction indicator light related to oxygen sensor performance
• Poor engine operation caused by inaccurate air-fuel ratio feedback
• Increased fuel consumption from faulty upstream sensor readings
• Elevated exhaust emissions from degraded sensor response
• Diagnostic trouble codes tied to the affected sensor circuit or system

Installation Notes and Tips

Confirm the vehicle year, make, model, and upstream position before ordering. Verify the connector shape, wire count, terminal count, and thread size against the original sensor to ensure proper replacement. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear before installation, since damaged related components can shorten sensor life and affect diagnosis.

For fitment-based searches, this part is listed for 2022-2024 Nissan Altima upstream, 2023-2025 INFINITI QX50 upstream, and 2023-2025 INFINITI QX55 upstream. This part cross-references Walker Products OE-style oxygen sensor applications for the same vehicle positions.

Quality Assurance

Walker Products has been manufacturing engine management and fuel system components since 1946 and operates with ISO 9001/TS 16949 quality systems. The OE Base Sensor line is built around application-specific fitment and diagnostic performance for modern emissions control systems.