This 4-wire narrow-band oxygen sensor fits 2006-2008 Hyundai Sonata, Kia Optima, 2007-2008 Kia Magentis and Rondo with the 2.4L I4 engine in the downstream position 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 350-34574 Oxygen Sensor Features:

• Fits 2006-2008 Hyundai Sonata, Kia Optima; 2007-2008 Kia Magentis, Rondo with the 2.4L I4 engine
• Sensor location by application: B1S2 (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, 475 mm (18.7 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