The 4-wire narrow-band oxygen sensor is a replacement sensor for 2016 Chevy Cruze and 2008-2009 Saturn Astra with the 1.8L I4 engine. 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 350-34326 Oxygen Sensor Features:

• Fits 2016 Chevy Cruze; 2008-2009 Saturn Astra with the 1.8L I4 engine
• 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, 475 mm (18.7 in.) overall length
• Female oblong connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue