The 4-wire narrow-band oxygen sensor is a replacement sensor for 2017-2023 Alfa Romeo Giulia, 2018-2025 Alfa Romeo Stelvio and 2012-2019 Fiat 500 in the downstream position. It signals whether the exhaust is running rich or lean so the engine computer can trim fuel delivery. A built-in heater brings the element to operating temperature quickly after a cold start.

Walker Products 350-34156 Oxygen Sensor Features:

• Fits 2017-2023 Alfa Romeo Giulia; 2018-2025 Alfa Romeo Stelvio; 2012-2019 Fiat 500
• Engine coverage includes 1.4L I4, 2.0L I4 applications
• Sensor location by application: B1S2 (bank and sensor number)
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 700 mm (27.6 in.) overall length
• Female oblong connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue