This 4-wire narrow-band oxygen sensor fits select 2016-2026 Buick, Chevy and GMC applications and 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 250-241188 Oxygen Sensor Features:

• Fits 2016-2022 Buick Encore, Chevy Spark; 2020-2024 Buick Encore GX; 2024 Buick Envista; 2016-2019 Chevy Cruze, Volt; 2016 Chevy Cruze NG; 2016-2024 Chevy Malibu
• Fits 2018-2021 Chevy Cavalier; 2018-2024 Chevy Equinox, GMC Terrain; 2018 Chevy Nuevo Aveo; 2019-2023 Chevy Aveo; 2021-2024 Chevy Trailblazer, Trax
• Also fits select Buick, Chevy and GMC applications
• Sensor locations by application: B1S1, B1S2 (bank and sensor number)
• Used in both upstream and downstream positions, depending on application
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 325 mm (12.8 in.) overall length
• Male/female oblong connector at the harness end with 4 pin terminals
• Platinum electrode layer with a protective coating against combustion residue