The 5-wire wide-band oxygen sensor is a replacement sensor for select 2019-2026 Audi, Hyundai, Kia and Mercedes-Benz applications in the upstream position. It measures the exhaust air-fuel ratio across a broad range so the engine computer can meter fuel precisely. It uses a female circle connector with 6 terminals.

Walker Products 250-25143 Oxygen Sensor Features:

• Fits 2019-2020 Audi A6 Quattro; 2020 Audi Q5; 2020-2025 Audi Q5 PHEV; 2021-2022 Audi A7 Sportback, Q7, Mercedes-Benz E450, GLE53 AMG; 2020-2026 Hyundai Sonata
• Fits 2021-2023 Hyundai Santa Fe; 2022-2025 Hyundai Santa Cruz; 2022-2026 Hyundai Tucson; 2021-2024 Kia Sorento; 2023-2024 Kia Sportage; 2019-2022 Mercedes-Benz C300
• Also fits select Audi, Hyundai, Kia and Mercedes-Benz applications
• Sensor location by application: B1S1 (bank and sensor number)
• 5-wire wide-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 420 mm (16.5 in.) overall length
• Female circle connector at the harness end with 6 spade terminals
• Platinum electrode layer with a protective coating against combustion residue