The 5-wire wide-band oxygen sensor is a replacement sensor for select 2005-2012 BMW and Mercedes-Benz 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 350-35054 Oxygen Sensor Features:

• Fits 2008-2010 BMW 535i, X6; 2008 BMW 535xi; 2009-2010 BMW 535i xDrive; 2010-2012 BMW 740i; 2011-2012 BMW 740Li; 2005-2006 Mercedes-Benz E320
• Fits 2007-2009 Mercedes-Benz CLK63 AMG
• Engine coverage includes 3.0L I6, 3.2L I6, 6.3L V8 applications
• Sensor location by application: B1S1 (bank and sensor number)
• Used in both upstream and downstream positions, depending on application
• 5-wire wide-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 1300 mm (51.2 in.) overall length
• Male oblong connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue