The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2018-2026 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 250-241280 Oxygen Sensor Features:

• Fits 2018-2024 Audi RS5, S5; 2018-2025 Audi S4, S5 Sportback, SQ5; 2019-2020 Audi A3 Quattro, S3; 2019-2025 Audi A6 Quattro, A7 Sportback, RS5 Sportback
• Fits 2019-2026 Audi A8 Quattro, Porsche Macan, Volkswagen Jetta; 2019-2023 Audi TT, TTS Quattro; 2020-2026 Audi A6 allroad; 2020-2025 Audi S6, S7 Sportback; 2020 Audi S7
• 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
• Female oblong connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue