Walker 350-34112 Oxygen Sensor

Walker Oxygen Sensor for OE Replacement Fitment

Walker Products 350-34112 is a heated oxygen sensor built for specific vehicle applications and OE-style replacement fitment. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions monitoring on supported Volkswagen, Audi, and Porsche applications.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for exact application fitment. The 350-34112 follows that approach with a threaded, specific-fit design and a 4-wire heated configuration for direct replacement use on listed upstream and downstream positions.

Key Features

• Part number: 350-34112
• Heated oxygen sensor for emissions and engine management systems
• Specific fit design for listed vehicle applications
• 4-wire configuration with 22-gauge wiring
• Radiused polygon male connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 29.06
• Overall length: 32.6
• Compatible with upstream, downstream, left, and right positions depending on application

Detailed Description

Walker Products 350-34112 is an OE replacement oxygen sensor for a wide range of Volkswagen, Audi, and Porsche applications. It is listed for 1998-2024 model years across upstream and downstream positions, including Volkswagen Saveiro, Polo, Vento, CrossFox, Gol Sedan, Jetta, SportVan, Touareg, Phaeton, Passat, Beetle, and Audi A3, A4, A6 Quattro, Allroad Quattro, TT, TT Quattro, S3, plus Porsche Cayenne. This part number is also referenced for specific engine and bank positions such as B1S2 and cylinder-group applications where noted.

As a heated oxygen sensor, it supports ECU feedback needed for air-fuel control and emissions monitoring. If the original sensor is failing, the vehicle may store fault codes, run poorly, use more fuel, or trigger the malfunction indicator light. For accurate diagnosis, inspect the sensor, wiring harness, and connector for damage before replacement. This part cross-references Bosch 17014 and Denso 234-9005 for the same application.

Common Issues This Sensor May Address

• Check engine light related to oxygen sensor performance
• Fault codes stored in the ECU for upstream or downstream sensor circuits
• Poor fuel economy from incorrect air-fuel feedback
• Rough engine operation caused by inaccurate exhaust readings
• Increased exhaust emissions from a worn or failed sensor

Installation Notes and Tips

Confirm the exact position before installation: upstream, downstream, left, or right, depending on the vehicle listing. Match the connector shape, wire count, and thread diameter to the original sensor. Because fitment varies by model year and engine designation, verify the application against the vehicle’s VIN and existing sensor location before ordering. On vehicles with fault codes, clear stored codes after installation and confirm the repair with a scan tool.

Quality Assurance

Walker Products has manufactured engine management and oxygen sensor components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-34112 is built as a specific-application replacement to support the diagnostic requirements of the vehicle ECU.