The 4-wire narrow-band oxygen sensor is a replacement sensor for 2007-2015 Lexus GS350, 2014-2015 Lexus IS250, 2014-2018 Lexus IS350, 2015-2018 Lexus RC350, 2016-2018 Lexus IS300 and RC300 in the downstream position. It 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 350-34438 Oxygen Sensor Features:

• Fits 2007-2015 Lexus GS350; 2014-2015 Lexus IS250; 2014-2018 Lexus IS350; 2015-2018 Lexus RC350; 2016-2018 Lexus IS300, RC300
• Engine coverage includes 2.5L V6, 3.5L V6 applications
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 1125 mm (44.3 in.) overall length
• Male square connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue