The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2013-2025 Audi, Seat and Volkswagen applications 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 350-34957 Oxygen Sensor Features:

• Fits 2016-2020 Audi A3; 2017-2018 Audi A1; 2019-2025 Audi Q3; 2013-2020 Seat Leon; 2016-2019 Seat Toledo; 2017-2024 Seat Ateca; 2018-2024 Seat Ibiza, Volkswagen Tiguan
• Fits 2019-2024 Seat Tarraco; 2015-2018 Volkswagen Golf; 2021-2024 Volkswagen Taos; 2023-2024 Volkswagen Nivus
• Engine coverage includes 1.0L I3, 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, 850 mm (33.5 in.) overall length
• 825 mm (32.5 in.) wiring harness
• Female d connector at the harness end with 4 blade terminals
• Platinum electrode layer with a protective coating against combustion residue