The oxygen sensor installs on select 2017-2024 Buick, Cadillac, Chevy and GMC 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 250-241268 Oxygen Sensor Features:

• Fits 2017-2019 Buick LaCrosse; 2018-2020 Buick Regal Sportback
• Fits 2021-2024 Cadillac Escalade, Escalade ESV, Chevy Express 3500, Express 4500, Suburban, Tahoe, GMC Savana 2500, Savana 3500, Savana 4500, Yukon, Yukon XL
• Also fits select Buick, Cadillac, Chevy and GMC applications
• Sensor locations by application: B1S1, B2S1 (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
• Female oblong connector at the harness end with 4 pin terminals
• Platinum electrode layer with a protective coating against combustion residue