The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2006-2017 Buick, Cadillac, Chevy, GMC and other applications. It signals whether the exhaust is running rich or lean so the engine computer can trim fuel delivery. It uses a male square connector.

Walker Products 350-34483 Oxygen Sensor Features:

• Fits 2006-2011 Buick Lucerne, Cadillac DTS; 2006 Buick Rainier, Chevy Avalanche 1500, Sonora, Trailblazer EXT, GMC Envoy XL, Isuzu Ascender, i-280, i-350
• Fits 2008-2009 Buick Allure, LaCrosse; 2006-2007 Cadillac CTS, Chevy Monte Carlo, Suburban 1500, Tahoe, GMC Yukon, Yukon XL 1500
• Also fits select Buick, Cadillac, Chevy, GMC, Hummer, Isuzu, Pontiac and Saab applications
• Sensor locations by application: B1S1, B1S2, 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, 430 mm (16.9 in.) overall length
• Male square connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue