The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2000-2010 Chevy, Kia, Mazda and Suzuki 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 350-34026 Oxygen Sensor Features:

• Fits 2004-2006 Chevy Epica; 2004-2010 Chevy Optra; 2001-2005 Kia Rio; 2000-2002 Mazda 626; 2003-2008 Mazda 6; 2004-2005 Suzuki Forenza, Verona; 2005 Suzuki Reno
• Engine coverage includes 1.5L I4, 1.6L I4, 2.0L I4, 2.5L I6, 2.5L V6, 3.0L V6 applications
• Sensor locations by application: B1S1, 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, 440 mm (17.3 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