Walker 250-54118 Oxygen Sensor - Upstream or Upstream Rear

Walker Products OE Oxygen Sensor 250-54118

Walker Products OE 250-54118 is an oxygen sensor engineered as an original equipment replacement for specific Lexus and Toyota applications. It provides the ECU with the exhaust feedback needed for accurate fuel control, emissions monitoring, and fault detection.

Key Features

• OE-style oxygen sensor for emission control systems
• Application-specific fitment and connector position
• Supports ECU feedback for air-fuel management
• Built for upstream sensor locations, including right, left, and rear positions
• Walker Products OE line for Lexus RX350, RX350L, RX450hL, and Toyota Highlander applications

Detailed Description

The Walker Products OE 250-54118 oxygen sensor is built for direct replacement use on select Lexus RX350, RX350L, RX450hL, and Toyota Highlander models. This sensor is matched to the listed vehicle position so the engine control unit can monitor exhaust oxygen content and adjust fuel delivery as needed. For drivers searching for a Lexus RX350 upstream oxygen sensor or a Toyota Highlander Bank 1 Sensor 1 replacement, this part number provides a targeted OE-style solution.

Walker Products OE focuses on replacement sensors developed for specific applications rather than universal use. That approach helps ensure the sensor location, connector, and feedback characteristics align with the vehicle’s diagnostic strategy. The 250-54118 part number appears across multiple upstream positions, including upstream right, upstream left, and upstream rear, depending on the model and build.

Fitment

• Fits 2022 Lexus RX350, Upstream Right, OE Base Sensor
• Fits 2022 Lexus RX350L, Upstream Left, OE Base Sensor
• Fits 2022 Lexus RX450hL, Upstream Left, OE Base Sensor
• Fits 2016-2021 Lexus RX350, Upstream Rear, Japan Built Vehicle; Upstream; Rear; Walker Products OE
• Fits 2018-2021 Lexus RX350L, Upstream Rear, Upstream oxygen sensor for rear exhaust system.; Walker Products OE
• Fits 2021 Lexus RX450hL, Upstream Rear, Upstream oxygen sensor for rear exhaust system.; Walker Products OE
• Fits 2015-2019 Toyota Highlander, Upstream, Bank 1 Sensor 1 needs an upstream oxygen sensor.; Walker Products OE

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough running caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Elevated exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the sensor circuit or related systems

Installation Notes

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear. Confirm the vehicle position and build details against the listed fitment, especially on Lexus RX350, RX350L, RX450hL, and Toyota Highlander applications where upstream locations vary by model and year. This part number, 250-54118, should be installed in the exact position specified for the vehicle.

Quality Assurance

Walker Products has produced engine management and oxygen/air-fuel sensors since 1946 and manufactures to automotive ISO 9001/TS 16949 standards. The Walker Products OE line is developed as an OE replacement for specific vehicle applications and diagnostic requirements.