The oxygen sensor installs in the upstream position on select 2008-2019 BMW and Mini applications. It measures the exhaust air-fuel ratio across a broad range so the engine computer can meter fuel precisely. A built-in heater brings the element to operating temperature quickly after a cold start.

Walker Products 350-35012 Oxygen Sensor Features:

• Fits 2008-2019 BMW X6; 2009-2015 BMW 750Li, 760Li; 2009-2016 BMW 750i; 2010-2015 BMW 550i GT, 750Li xDrive, 750i xDrive, Mini Cooper; 2010-2017 BMW 550i GT xDrive
• Fits 2010-2018 BMW X5; 2011-2016 BMW 550i, 550i xDrive; 2011-2015 BMW Alpina B7, B7 xDrive, B7L, B7L xDrive; 2012-2015 BMW 118i; 2012-2018 BMW 650i, 650i xDrive, M6
• Also fits select BMW and Mini applications
• Sensor locations by application: B1S1, B2S1 (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, 475 mm (18.7 in.) overall length
• Female rectangle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue