This 4-wire narrow-band oxygen sensor fits select 1995-2016 BMW and Land Rover applications 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 350-34142 Oxygen Sensor Features:

• Fits 1995-2001 BMW 750iL; 1995-1999 BMW 850Ci; 1996-1999 BMW 318i, 318is, 318ti; 1996-2003 BMW 325i; 1996-2001 BMW 740iL; 1996-1997 BMW 840Ci; 1996-2002 BMW Z3
• Fits 1997-2003 BMW 540i; 1997-2001 BMW 740i; 1999-2001 BMW 323i; 1999-2000 BMW 328i, 528i; 1999-2003 BMW M5; 2000 BMW 323Ci, 328Ci; 2000-2006 BMW X5; 2000-2003 BMW Z8
• Also fits select BMW and Land Rover applications
• Sensor location by application: B1S1 (bank and sensor number)
• Used in both upstream and downstream positions, depending on application
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 350 mm (13.8 in.) overall length
• Male circle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue