This 4-wire narrow-band oxygen sensor fits 2006-2007 Chevy Optra and 2002-2004 Kia Spectra and 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 350-34035 Oxygen Sensor Features:

• Fits 2006-2007 Chevy Optra; 2002-2004 Kia Spectra
• Engine coverage includes 1.8L I4, 2.0L I4 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, 550 mm (21.7 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