Walker 350-34123 Oxygen Sensor - Downstream

Walker OE Replacement Oxygen Sensor

Walker OE Replacement Part Number 350-34123 is a heated oxygen sensor built for specific vehicle applications and downstream placement. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions monitoring on the vehicles listed below.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for direct application matching
• Downstream position for listed Ferrari models
• 4-wire configuration with female connector
• 18.00 mm thread diameter
• 35.94 in. wiring harness length and 39.49 in. overall length
• 20-gauge wire construction

Product Details

Walker Products OE Replacement sensors are developed as direct replacements for original equipment applications, with fitment and connector layout matched to the vehicle and sensor position. Part Number 350-34123 is listed for 1995-2000 Ferrari 456 GT, 1997-1998 Ferrari 456 GTA, 1996-2000 Ferrari F355 Spider, and 1997-1998 Ferrari 550 Maranello in the downstream location. For Ferrari F355 Spider downstream service, Ferrari 456 GT downstream service, and Ferrari 550 Maranello downstream service, this sensor is specified to provide the ECU with the expected signal feedback for emissions system operation.

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946, and its OE Replacement line focuses on application-specific fitment rather than universal coverage. This part number 350-34123 cross-references no additional part numbers in the provided data.

Common Issues This Sensor Can Address

• Check engine light related to downstream oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Elevated exhaust emissions from a failing sensor signal
• Rough engine operation tied to incorrect ECU input
• Damaged sensor wiring or connector affecting signal quality

Installation Notes

Verify the downstream sensor location before installation and inspect the wiring harness and connector for heat damage, abrasion, or corrosion. Confirm thread diameter, connector gender, and harness length against the original part before replacement. If the vehicle has stored fault codes, clear them after installation and confirm the repair with a scan tool.

Quality Assurance

Walker Products manufactures engine management sensors under ISO 9001/TS 16949 quality systems. The OE Replacement line is built for application-specific fitment and ECU feedback requirements on the listed Ferrari models.