This 4-wire narrow-band oxygen sensor fits select 2007-2018 BMW 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 350-34229 Oxygen Sensor Features:

• Fits 2007-2017 BMW X3; 2011-2016 BMW 528i; 2012-2018 BMW 320i; 2012-2016 BMW 328i, 528i xDrive, Z4; 2012-2013 BMW 530i; 2012-2015 BMW X1; 2013-2018 BMW 320i xDrive
• Fits 2013-2016 BMW 328i xDrive; 2014-2016 BMW 220i, 228i, 328i GT xDrive, 428i, 428i xDrive, 520i; 2015-2016 BMW 228i xDrive, 428i Gran Coupe, 428i xDrive Gran Coupe
• Also fits select BMW applications
• Sensor location by application: B1S2 (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, 650 mm (25.6 in.) overall length
• Male rectangle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue