Walker 350-34854 Oxygen Sensor - Downstream

Walker 350-34854 Oxygen Sensor for Volkswagen Polo

Walker Products 350-34854 is a downstream oxygen sensor built as an OE-style replacement for specific Volkswagen Polo applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Compatible with Volkswagen Polo downstream applications, this sensor is a direct-fit option for vehicles that need accurate exhaust feedback from the downstream bank 1 sensor location.

Key Features

• Downstream oxygen sensor for specific Volkswagen Polo models
• OE-style replacement from Walker Products Aftermarket
• Application-specific fitment and connector positioning
• Supports ECU diagnostic feedback for emissions system monitoring
• Part number 350-34854 for easy lookup and ordering

Detailed Description

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed for original-equipment replacement needs. Part number 350-34854 is matched to the specified downstream position on Volkswagen Polo vehicles, including bank 1 sensor 2 and bank 1 sensor 3 applications listed in the fitment data. If your Volkswagen Polo has a failing downstream sensor, this replacement helps restore the exhaust signal the ECU uses to monitor catalyst and emissions performance.

This part number, 350-34854, is listed for 2013 Volkswagen Polo downstream applications and 2013-2014 and 2016-2017 Volkswagen Polo downstream bank 1 sensor 2 applications. Use the exact vehicle year and sensor position to confirm the correct match before ordering.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Poor fuel economy caused by incorrect exhaust feedback
• Elevated exhaust emissions from a worn sensor
• Rough engine operation tied to sensor signal issues
• Stored ECU fault codes for the affected sensor circuit

Installation Notes and Tips

Verify the sensor position on the vehicle before installation. For Volkswagen Polo fitment, confirm whether the application calls for downstream bank 1 sensor 2 or bank 1 sensor 3. Inspect the sensor wiring harness and connector for damage before replacing the part, since physical wear can shorten sensor life and affect operation.

Quality Assurance

Walker Products has produced engine management components since 1946 and operates as an ISO 9001/TS 16949 certified company. The 350-34854 oxygen sensor is built for the specified application and fitment position to deliver the diagnostic feedback expected by the ECU.