This 4-wire narrow-band oxygen sensor fits select 2015-2025 BMW and Toyota applications in the downstream position 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 350-341031 Oxygen Sensor Features:

• Fits 2015-2019 BMW 750Li; 2016-2018 BMW 330e; 2016-2019 BMW 330i, 750Li xDrive; 2016-2020 BMW 420i, 420i Gran Coupe
• Fits 2017-2020 BMW 120i, 430i, 430i Gran Coupe, 430i xDrive, 430i xDrive Gran Coupe, 530i, 530i xDrive, M760Li xDrive; 2017-2021 BMW 230i, 230i xDrive
• Also fits select BMW and Toyota 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, 850 mm (33.5 in.) overall length
• Female oblong connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue