The 4-wire narrow-band oxygen sensor is a replacement sensor for select 1992-2018 Chevy, Ford, Mazda and Pontiac applications. 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 350-34040 Oxygen Sensor Features:

• Fits 2006-2018 Chevy Aveo; 2006-2008 Chevy Aveo5, Pontiac Wave; 2011-2015 Chevy Matiz; 1993-1995 Ford Probe; 1992-1995 Mazda 929; 1993-2000 Mazda 626
• Fits 1993-1997 Mazda MX-6; 2007-2008 Pontiac G3
• Engine coverage includes 1.0L I4, 1.6L I4, 2.0L I4, 2.5L V6, 3.0L V6 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, 480 mm (18.9 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