The oxygen sensor installs on select 1990-2012 Buick, Chevy, GMC, Isuzu and other 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 350-34076 Oxygen Sensor Features:

• Fits 1996-2004 Buick Century, Chevy Monte Carlo, Oldsmobile Silhouette; 1996-2003 Buick LeSabre, Park Avenue, Regal, GMC Sonoma, Pontiac Bonneville, Grand Prix
• Fits 1996-1999 Buick Riviera, Oldsmobile 88, Aurora, LSS, Pontiac Trans Sport; 2002-2004 Buick Rendezvous; 1990-2003 Chevy S10; 1996-2002 Chevy Camaro, Pontiac Firebird
• Also fits select Buick, Chevy, GMC, Isuzu, Oldsmobile and Pontiac applications
• Sensor locations by application: B1S1, B1S2 (bank and sensor number)
• Used in the center 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, 320 mm (12.6 in.) overall length
• Male/female square connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue