Walker 350-341006 Oxygen Sensor - Downstream Rear

OE-Style Oxygen Sensor for Lexus and Toyota

Walker Products 350-341006 is a heated oxygen sensor built for specific downstream applications on select Lexus RX and Toyota Highlander models. It is engineered as an OE replacement sensor to deliver the diagnostic feedback the ECU expects, helping maintain proper engine management and emissions control.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for the listed Lexus and Toyota applications
• 4-wire configuration with female connector
• 23.15 in. wiring harness length and 20-gauge wire
• 18.00 mm thread diameter and 26.69 in. overall length
• Built for ECU feedback on emissions and fuel-control systems

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for OE-style replacement use. Part number 350-341006 is designed for the correct application and mounting position, including downstream right and downstream rear locations where specified. For fitment-based searches, this oxygen sensor is a direct-match option for 2022 Lexus RX350 downstream right, 2022 Lexus RX350L downstream right, 2022 Lexus RX450h downstream right, 2022 Lexus RX450hL downstream right, and select 2016-2021 Lexus RX350, RX350L, RX450h, RX450hL, plus 2017-2019 Toyota Highlander downstream rear applications. Walker Products 350-341006 is intended to restore accurate exhaust-gas feedback so the ECU can manage fuel trim and emissions monitoring correctly.

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

Confirm the exact vehicle, model year, and sensor position before installation. This part is specific to the listed downstream right and downstream rear applications, so correct placement matters. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement, and verify the exhaust bung thread size matches the 18.00 mm specification.

Quality Assurance

Walker Products has produced engine management components since 1946 and operates as an ISO 9001/TS 16949 certified company. The 350-341006 is manufactured for application-specific fitment and ECU feedback requirements on the listed Lexus RX and Toyota Highlander vehicles.