Walker 250-241327 Oxygen Sensor - Downstream Front

Walker OE Base Oxygen Sensor for Lexus RX450h

Walker OE Base Sensor 250-241327 is a heated narrow-band oxygen sensor built for direct replacement in emission control applications. It is engineered for the 2010 Lexus RX450h in the downstream front position, with the correct connector, terminal layout, and thread size for the specified application.

For Lexus RX450h owners searching for a downstream front oxygen sensor replacement, this Walker sensor is matched to the vehicle’s diagnostic feedback requirements and OE-style fitment. The 250-241327 part number is also identified as Walker Products 250-241327 for catalog and service reference.

Key Features

• Heated narrow-band oxygen sensor for emission control service
• Direct-fit application for 2010 Lexus RX450h, downstream front
• 4-wire design with square female connector
• Spade terminals, 4 terminal count, male terminal gender
• M18 x 1.5 thread size for the specified mounting location
• Walker OE Base Sensor line for OE-style replacement coverage

Detailed Description

Walker Products develops engine management and oxygen/air-fuel sensors as OE replacement parts for specific vehicle applications. The OE Base Sensor line focuses on application-specific fitment, so the sensor position, connector style, and electrical interface align with the vehicle’s ECU monitoring needs. On the 2010 Lexus RX450h, the downstream front oxygen sensor helps the engine management system monitor exhaust conditions after the catalyst and maintain proper diagnostic feedback.

Walker Products 250-241327 is a practical choice when replacing a failed oxygen sensor on a Lexus RX450h. This part number is listed for the 2010 Lexus RX450h, downstream front, and should be matched to the vehicle’s original connector and mounting configuration before installation.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation tied to sensor signal issues
• Elevated exhaust emissions from a failing sensor
• Diagnostic trouble codes stored in the ECU for sensor faults

Installation Notes and Tips

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals. Confirm the downstream front location on the 2010 Lexus RX450h and verify the M18 x 1.5 thread size, 4-wire layout, and square female connector match the original part. If the old sensor failed due to wiring damage, correct that condition before installing the new sensor.

Quality Assurance

Walker Products has manufactured engine management components since 1946 and operates with ISO 9001/TS 16949 quality systems. The OE Base Sensor line is built around application-specific replacement coverage for vehicles such as the Lexus RX450h, with cataloged fitment and diagnostic-system compatibility in mind.