This 4-wire narrow-band oxygen sensor fits select 2001-2019 BMW and Mercedes-Benz 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 350-34107 Oxygen Sensor Features:

• Fits 2006-2010 BMW 130i, 525i, 530i; 2006-2011 BMW 323i; 2006-2013 BMW 325i; 2006 BMW 325xi, 330xi, Mercedes-Benz CLS500, CLS55 AMG
• Fits 2006-2007 BMW 330i, 525xi, 530xi, Mercedes-Benz ML500, R500; 2006-2016 BMW Z4; 2007-2013 BMW 328i; 2007-2008 BMW 328xi, 335xi; 2007-2010 BMW 335i, X3, X5
• Also fits select BMW and Mercedes-Benz applications
• Sensor locations by application: B1S2, B2S1, 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, 500 mm (19.7 in.) overall length
• Male/female circle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue