The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2017-2026 Audi, Porsche 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 250-241222 Oxygen Sensor Features:

• Fits 2017-2026 Audi RS3; 2018-2024 Audi RS5; 2018-2022 Audi TT RS Quattro; 2019-2026 Audi Q8, Volkswagen Jetta; 2019-2025 Audi RS5 Sportback
• Fits 2020-2026 Audi Q7, RS Q8, SQ7, SQ8, Porsche Macan; 2020-2025 Audi S6, S7 Sportback; 2021-2026 Audi RS6 Avant, RS7 Sportback; 2017-2020 Porsche Panamera
• Also fits select Audi, Porsche 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, 925 mm (36.4 in.) overall length
• Female oblong connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue