The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2013-2024 Buick, Cadillac, Chevy and GMC applications in the downstream position. 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 250-241132 Oxygen Sensor Features:

• Fits 2014-2017 Buick Regal, Chevy Cheyenne, Silverado 2500, GMC Sierra
• Fits 2016-2019 Buick Cascada, Chevy Silverado 2500, Silverado 3500, Suburban 3500 HD, GMC Sierra 2500, 3500 HD
• Also fits select Buick, Cadillac, Chevy and GMC applications
• Sensor locations by application: B1S2, B2S2 (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, 375 mm (14.8 in.) overall length
• Male/female oblong connector at the harness end with 4 pin terminals
• Platinum electrode layer with a protective coating against combustion residue