The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2005-2024 Subaru and Toyota applications. 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 350-34052 Oxygen Sensor Features:

• Fits 2005-2024 Subaru Outback; 2006-2007 Subaru B9 Tribeca; 2008-2024 Subaru Impreza, Legacy; 2008-2014 Subaru Tribeca; 2009-2024 Subaru Forester; 2012-2014 Subaru WRX
• Fits 2013-2016 Subaru XV; 2013-2015 Subaru XV Crosstrek; 2016-2024 Subaru Crosstrek; 2009 Toyota Rush; 2020-2022 Toyota Yaris; 2020 Toyota Yaris R
• Engine coverage includes 1.5L I4, 2.0L H4, 2.5L H4, 3.0L H6, 3.6L H6 applications
• Sensor location by application: B1S2 (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, 400 mm (15.7 in.) overall length
• Male/female square connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue