Walker 350-34960 Oxygen Sensor - Upstream

Walker Oxygen Sensor for Volkswagen Polo

Walker Products Part Number 350-34960 is an upstream oxygen sensor engineered as an OE-style replacement for specific Volkswagen Polo applications. It is built to provide the ECU with the diagnostic feedback needed for proper fuel control and emissions monitoring.

Key Features

• Upstream oxygen sensor for Bank 1 Sensor 1 applications
• Direct-fit replacement for 2003-2006 Volkswagen Polo, upstream
• Supports ECU feedback for air-fuel and emissions management
• Built for application-specific fitment and sensor position
• Walker Products Aftermarket engine management sensor line

Detailed Description

Walker Products 350-34960 is part of the Walker Products Aftermarket line of engine management and oxygen/air-fuel sensors. This product line is developed for OE-style replacement use, with each part number matched to a specific vehicle application and sensor position. For 2003-2006 Volkswagen Polo models, this upstream oxygen sensor is specified for Bank 1 Sensor 1 service and is intended to restore the feedback the ECU uses to manage combustion and emissions.

When an oxygen sensor begins to fail, the vehicle can run poorly, use more fuel, produce higher exhaust emissions, or trigger the malfunction indicator light. On affected Volkswagen Polo vehicles, the sensor, wiring harness, and connector should also be inspected for physical damage, since damage in those areas can shorten service life and affect signal quality. Part number 350-34960 is a focused replacement for the upstream location, and 350-34960 is the correct reference to verify during ordering and service.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Rough engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate sensor readings
• Elevated exhaust emissions from poor mixture control
• Fault codes stored in the ECU for Bank 1 Sensor 1

Installation Notes

Confirm the vehicle is a 2003-2006 Volkswagen Polo with an upstream Bank 1 Sensor 1 requirement before ordering. Inspect the sensor connector, harness, and surrounding wiring before installation, and verify the mounting location matches the upstream position. After installation, clear any stored fault codes and confirm the ECU reads the new sensor correctly.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-34960 is manufactured for the specified application and position to support proper diagnostic system feedback.