Walker 350-35123 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker OE Replacement Oxygen Sensor 350-35123

Walker OE Replacement oxygen sensor 350-35123 is a specific-fit, heated wide-band sensor built for direct application coverage on select Porsche, Ford, Lincoln, Volkswagen, and Audi vehicles. It is engineered to deliver the ECU feedback needed for accurate air-fuel control and emissions monitoring.

Key Features

• Heated wide-band oxygen sensor for precise exhaust feedback
• Specific-fit design for the listed upstream positions
• 5-wire configuration with oblong connector and male spade terminals
• M18 x 1.5 threaded mounting with 22 mm wrench size
• Overall length: 758 mm
• OE Replacement line from Walker Products

Product Details

The Walker OE Replacement line focuses on application-specific engine management sensors built to match original equipment fitment and diagnostic requirements. Part number 350-35123 is made for upstream sensor locations, including Upstream Right, Upstream Left, and Upstream positions depending on the vehicle application. This makes it a direct replacement choice for vehicles such as the 2014-2019 Porsche 911, 2011-2017 Ford Expedition, and 2008-2014 Volkswagen GTI.

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946, and this sensor reflects that application-focused approach. If your vehicle is showing fuel trim issues, emissions faults, or a malfunction indicator light tied to the oxygen sensor circuit, 350-35123 is the OE-style replacement to verify against the exact position and engine configuration.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Incorrect air-fuel ratio feedback to the ECU
• Rough running caused by inaccurate exhaust oxygen readings
• Increased fuel consumption from sensor degradation
• Elevated exhaust emissions from a failing sensor circuit

Installation Notes

Confirm the exact upstream position before ordering, since this part is listed for multiple vehicle-specific locations. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals before installation. Verify thread size, connector shape, and wire count against the original sensor to ensure proper fitment on the Porsche 911, Ford F-150, Ford Expedition, Lincoln Navigator, Volkswagen CC, Volkswagen Eos, Volkswagen GTI, Audi A3, and related applications.

Quality Assurance

Walker Products manufactures this OE Replacement sensor as an application-specific part for the listed vehicles and positions, with design intent centered on original-equipment-style diagnostic feedback and fitment accuracy.