The 4-wire narrow-band oxygen sensor is a replacement sensor for 2001-2004 Chevy Tracker, 1999-2002 Suzuki Esteem, 2001-2005 Suzuki Grand Vitara, 2002-2007 Suzuki Aerio and 2004 Suzuki Vitara in the upstream 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 350-34347 Oxygen Sensor Features:

• Fits 2001-2004 Chevy Tracker; 1999-2002 Suzuki Esteem; 2001-2005 Suzuki Grand Vitara; 2002-2007 Suzuki Aerio; 2004 Suzuki Vitara
• Engine coverage includes 1.8L I4, 2.0L I4, 2.3L I4, 2.5L V6 applications
• Sensor location by application: B1S1 (bank and sensor number)
• 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
• Female square connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue