Walker 250-241255 Oxygen Sensor - Downstream, Downstream Rear or Downstream Right

Walker OE Oxygen Sensor 250-241255

Walker Products OE 250-241255 is a downstream oxygen sensor built as an OE-style replacement for specific Nissan and INFINITI applications. It provides the ECU with the exhaust feedback needed for proper fuel control and emissions monitoring on supported vehicles.

Key Features

• Downstream oxygen sensor for monitored exhaust feedback
• OE Base Sensor application coverage for select Nissan and INFINITI models
• Engineered for specific fitment position and diagnostic system response
• Supports ECU fault-code monitoring on newer vehicles
• Walker Products OE line for application-specific replacement parts

Application Details

Compatible with downstream positions on 2018-2025 Nissan and INFINITI models, including Nissan Altima, Sentra, Versa, Kicks, Kicks Play, Pathfinder, TITAN, and TITAN XD, plus INFINITI QX50 and QX55. This part number, 250-241255, is listed for downstream, downstream right, and downstream rear locations depending on the vehicle and engine configuration. For fitment-based searches, this is the correct choice when you need a downstream oxygen sensor for a 2020-2025 Nissan Sentra, downstream; a 2022-2025 Nissan Altima, downstream; or a 2023-2025 INFINITI QX50, downstream.

Walker Products OE focuses on application-specific engine management sensors built to match the vehicle’s required position and diagnostic feedback. The 250-241255 is intended for vehicles that rely on downstream sensor input to monitor exhaust efficiency and help the ECU detect emissions-related faults. If the sensor, wiring harness, or connector is damaged, drivability and emissions performance can be affected.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Poor fuel economy caused by incorrect exhaust feedback
• Elevated exhaust emissions from a failing sensor
• Stored ECU fault codes tied to the affected sensor circuit
• Rough engine operation when emissions feedback is inaccurate

Installation Notes

Verify the exact position before ordering, since this part is used in downstream, downstream right, and downstream rear locations across different applications. Inspect the sensor connector and wiring harness for physical damage before installation, and confirm the vehicle’s fault codes point to the affected sensor circuit. For fitment-based searches, confirm the model year and position against the vehicle’s service information before replacing the sensor.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an ISO 9001/TS 16949 certified company. Part number 250-241255 is part of the Walker Products OE line, built for application-specific replacement use on supported Nissan and INFINITI vehicles.