The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2013-2024 Audi, Seat and Volkswagen applications in the upstream 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 350-34991 Oxygen Sensor Features:

• Fits 2016-2020 Audi A3; 2020-2023 Audi Q3; 2013-2020 Seat Leon; 2017-2019 Seat Ateca, Volkswagen Tiguan; 2018-2019 Seat Toledo; 2019-2024 Seat Tarraco; 2024 Seat Ibiza
• Fits 2015-2018 Volkswagen Golf; 2023-2024 Volkswagen Nivus
• Engine coverage includes 1.0L I3, 1.4L I4 applications
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex
• Platinum electrode layer with a protective coating against combustion residue