Walker 350-34156 Oxygen Sensor - Downstream

Walker 350-34156 Oxygen Sensor for Fiat 500

Walker Products 350-34156 is a heated oxygen sensor built as a specific-fit OE-style replacement for select Fiat 500 applications. It is designed for downstream Bank 1 Sensor 2 locations on turbocharged models, helping the ECU monitor exhaust feedback and maintain proper engine management.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the correct vehicle application and mounting position
• 4-wire configuration with female connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 25.12 in.; overall length: 28.66 in.
• Radiused polygon connector shape for application-specific fitment

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered as direct replacements for original equipment parts. Part number 350-34156 is built for downstream use on select Fiat 500 models, including turbo engine applications where the sensor location is Bank 1 Sensor 2. If the original sensor is aging or damaged, the ECU may log fault codes and the vehicle can show poor running behavior, higher fuel use, increased emissions, or a malfunction indicator light. This sensor is intended to restore accurate exhaust feedback for the affected system. Walker 350-34156 is listed for 2012-2019 Fiat 500 downstream applications, with specific turbo engine coverage on 2012-2014 models.

What It Helps Address

• Check engine or malfunction indicator light related to the downstream oxygen sensor
• Fault codes stored in the ECU for Bank 1 Sensor 2
• Rough engine operation caused by inaccurate exhaust feedback
• Increased fuel consumption from a failing oxygen sensor
• Elevated exhaust emissions from degraded sensor performance

Installation Notes and Tips

• Confirm the vehicle is a 2012-2019 Fiat 500 with downstream Bank 1 Sensor 2 fitment before ordering.
• Inspect the sensor connector, wiring harness, and nearby exhaust wiring for heat damage or abrasion.
• Verify the threaded mounting location and connector style match the original sensor.
• Clear stored diagnostic trouble codes after installation and confirm the repair with a scan tool.

Quality Assurance

Walker Products has manufactured engine management components since 1946 and operates under Automotive ISO9001/TS 16949 certification. Part number 350-34156 reflects the brand’s OE-replacement approach for specific vehicle applications, including Fiat 500 downstream oxygen sensor service.