Walker 350-34093 Oxygen Sensor - Downstream

Walker 350-34093 Oxygen Sensor for Toyota Highlander

Walker Products 350-34093 is a heated oxygen sensor built as a specific-fit OE replacement for select Toyota Highlander applications. It is engineered to provide the ECU with the correct feedback for downstream bank 1 sensor 2 monitoring, helping maintain proper emissions system operation.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for direct application fitment. The 350-34093 follows that approach with a threaded mounting design, a female radiused polygon connector, and a 4-wire heated sensor layout for the listed Toyota Highlander models.

Key Features

• Specific-fit oxygen sensor for select Toyota Highlander downstream applications
• Heated sensor design for faster operating response
• 4-wire configuration with 20-gauge wiring
• 29.06 in. wiring harness length and 32.6 in. overall length
• 18.0 mm thread diameter with threaded mounting type
• Female radiused polygon connector for application-specific connection
• Walker Products part number 350-34093

Detailed Description

This Walker oxygen sensor is designed for downstream bank 1 sensor 2 use on select 2005-2007 and 2015-2019 Toyota Highlander models. As an emissions control sensor, it helps the ECU monitor exhaust oxygen content so the vehicle can manage fuel control and catalyst-related diagnostics. If the original sensor is aging or damaged, the vehicle may store fault codes and show drivability or emissions-related symptoms.

Walker Products 350-34093 is built for specific fitment rather than universal use, which helps match the sensor position, connector style, and harness length required by the application. For Toyota Highlander owners searching for a downstream oxygen sensor replacement, this part number provides a direct-fit option for the listed model years.

What It May Help Resolve

• Check engine light related to downstream oxygen sensor performance
• Stored ECU fault codes tied to bank 1 sensor 2
• Poor fuel economy caused by inaccurate exhaust feedback
• Increased exhaust emissions from a worn sensor
• Rough engine operation linked to emissions system faults

Installation Notes and Tips

Verify the vehicle’s sensor position before ordering. This part is listed for downstream bank 1 sensor 2 on specific Toyota Highlander models, including 2005-2007 Toyota Highlander, downstream, and 2015-2019 Toyota Highlander, downstream. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals before installation. Confirm the thread diameter and connector shape match the original unit, and clear diagnostic trouble codes after replacement if required by the repair procedure.

Quality Assurance

Walker Products states that its engine management and oxygen/air-fuel sensors are developed as OE replacement parts for worldwide vehicle applications. The company is ISO 9001/TS 16949 certified and has supplied engine management components since 1946. This part cross-references no additional part numbers in the provided data.