The oxygen sensor installs in the downstream position on select 2015-2023 Audi, Seat and Volkswagen applications. 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 350-34788 Oxygen Sensor Features:

• Fits 2015-2020 Audi A3; 2015-2018 Audi A3 Quattro, S3, Seat Leon, Volkswagen GTI, Golf; 2015-2016 Audi A8 Quattro; 2016-2018 Audi TT, TTS Quattro; 2017-2023 Audi R8
• Fits 2020-2022 Audi A1; 2016-2017 Seat Ibiza, Toledo; 2021 Seat Formentor; 2015-2019 Volkswagen Golf R, SportWagen; 2017-2019 Volkswagen Golf Alltrack
• Also fits select Audi, Seat and Volkswagen applications
• Sensor locations by application: B1S2, B2S2 (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, 775 mm (30.5 in.) overall length
• Male oblong connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue