Walker 350-341029 Oxygen Sensor - Downstream Left

Walker 350-341029 Oxygen Sensor for Lexus

Walker Products 350-341029 is a heated downstream left oxygen sensor built as an OE replacement for select Lexus applications. It is engineered for specific vehicle fitment and ECU feedback, making it a direct-match option for Lexus IS300, IS350, RC300, RC350, and GS350 models with the correct downstream left position.

Key Features

• Heated oxygen sensor for downstream left placement
• Specific-fit design for the listed Lexus applications
• 4-wire configuration with male connector
• 39.88 in. wiring harness length and 43.43 in. overall length
• 18.00 mm thread diameter
• Wire gauge measurement: 22
• OE-style replacement from Walker Products Aftermarket

Product Line Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for application-specific replacement use. The 350-341029 follows that approach with a sensor layout matched to the vehicle position and the diagnostic feedback expected by the ECU. For Lexus owners, that means a direct replacement path for the downstream left oxygen sensor on supported IS300, IS350, RC300, RC350, and GS350 models.

Detailed Description

This Walker oxygen sensor is designed for vehicles that rely on accurate exhaust feedback to manage fuel control and emissions monitoring. The heated sensor design helps the system reach operating temperature efficiently, while the specific-fit construction supports proper connector and harness routing. Walker Products 350-341029 is a practical choice when replacing a downstream left oxygen sensor on 2016-2025 Lexus models listed in the fitment data, including Lexus IS300, Lexus IS350, Lexus RC300, Lexus RC350, and Lexus GS350.

This part cross-references no listed interchange numbers for the same application.

What It Helps Address

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

Installation Notes and Tips

Verify the downstream left position before ordering, since this sensor is application-specific. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. Confirm thread size, connector style, and harness routing against the original part to ensure proper fit on the Lexus IS300, IS350, RC300, RC350, or GS350 application.

Quality Assurance

Walker Products states that its engine management sensors are manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, the brand has supplied oxygen and air-fuel sensors for OE-style replacement use across many vehicle platforms.