This 4-wire narrow-band oxygen sensor fits 1999-2008 Mitsubishi Montero Sport, 2001-2019 Mitsubishi Montero and 2003-2006 Mitsubishi Lancer in the upstream 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 350-34033 Oxygen Sensor Features:

• Fits 1999-2008 Mitsubishi Montero Sport; 2001-2019 Mitsubishi Montero; 2003-2006 Mitsubishi Lancer
• Engine coverage includes 2.0L I4, 3.0L V6, 3.5L V6, 3.8L 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, 725 mm (28.5 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