Walker 350-341012 Oxygen Sensor - Downstream Front

OE Replacement Oxygen Sensor for Lexus RX450h

Walker OE Replacement oxygen sensors are built for direct-fit engine management service, with application-specific design for the vehicle position and ECU feedback requirements. This Walker 350-341012 oxygen sensor is a heated narrow-band sensor for the downstream front location on the 2010 Lexus RX450h.

Key Features

• Heated narrow-band oxygen sensor for emissions and fuel-control feedback
• Threaded M18 x 1.5 mounting for direct replacement service
• 4-wire design with square female connector and spade terminals
• 280 mm overall length for the specified application
• OE Replacement line engineered for vehicle-specific fitment
• Fits 2010 Lexus RX450h, downstream front

Product Details

The Walker 350-341012 is an OE Replacement oxygen sensor intended for the downstream front position on the 2010 Lexus RX450h. As a heated narrow-band sensor, it helps provide the ECU with the exhaust feedback needed for proper system monitoring. Walker Products develops engine management and oxygen/air-fuel sensors around specific vehicle applications, with attention to connector style, terminal layout, thread size, and mounting position. This part number, 350-341012, is matched to the listed Lexus RX450h application for direct-fit service.

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 emissions system faults
• Elevated exhaust emissions from a failing downstream sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Confirm the downstream front sensor location before installation. Inspect the sensor wiring harness, connector, and surrounding exhaust components for heat damage, corrosion, or physical wear, since damaged wiring can shorten sensor life and affect readings. Verify the M18 x 1.5 thread engagement and connector orientation match the vehicle before final tightening. For the 2010 Lexus RX450h, use the vehicle’s service information to confirm the exact sensor position and diagnostic procedure.

Quality Assurance

Walker Products has manufactured engine management components since 1946 and operates as an ISO 9001/TS 16949 certified company. The OE Replacement line is built around application-specific fitment and diagnostic feedback requirements for the listed vehicle.