Denso part number 234-4018 is a replacement narrow-band Oxygen (O2) Sensor with 4 wire 15.35 inch long wiring harness for: Buick: (1997-2000 Century, 1997-2003 LeSabre, 1997-2003 Park Avenue, 1997-2003 Regal, 1997-1999 Riviera, 1997-1998 Skylark) Cadillac: (1996-1999 DeVille, 1996-2000 Eldorado, 1999-2000 & 2002 Escalade, 2002 Escalade EXT, 1996-2000 Seville) Chevrolet: (1996-1997 Astro, 2002 Avalanche 1500, 1996-1999 C1500, 1996-1999 C1500 Suburban, 1996-2000 C2500, 1996-1999 C2500 Suburban, 1996-2000 C3500, 1997-2002 Camaro, 1996-2002 Express 1500, 1996-2002 Express 2500, 1996-2002 Express 3500, 1996 G30, 2000-2003 Impala, 1996-1999 K1500, 1996-1999 K1500 Suburban, 1996-2000 K2500, 1996-1999 K2500 Suburban, 1996-2000 K3500, 1997-2001 Lumina, 1997-2000 Malibu, 1997-2003 Monte Carlo, 1996-1999 P30, 1999-2002 Silverado 1500, 2001 Silverado 1500 HD, 1999-2001 Silverado 2500, 2001 Silverado 2500 HD, 2001 Silverado 3500, 2000-2002 Suburban 1500, 2000-2001 Suburban 2500, 1996-2002 Tahoe, 1997-2000 Venture) GMC: (1996-1999 C1500, 1996-1999 C1500 Suburban, 1996-2000 C2500, 1996-1999 C2500 Suburban, 1996-2000 C3500, 1996 G3500, 1996-1999 K1500, 1996-1999 K1500 Suburban, 1996-2000 K2500, 1996-1999 K2500 Suburban, 1996-2000 K3500, 1996-1999 P3500, 1996-1997 Safari, 1996-2002 Savana 1500, 1996-2002 Savana 2500, 1996-2002 Savana 3500, 1999-2002 Sierra 1500, 2001 Sierra 1500 HD, 1999-2001 Sierra 2500, 2001 Sierra 2500 HD, 2001 Sierra 3500, 1996-2002 Yukon, 2000-2002 Yukon XL 1500, 2000-2001 Yukon XL 2500) Oldsmobile: (1997-1999 88, 1997-1998 Achieva, 1999-2000 Alero, 1996-1999 Aurora, 1997-1999 Cutlass, 1997 Cutlass Supreme, 1998-1999 Intrigue, 1997-1999 LSS, 1997-1998 Regency, 1997-2000 Silhouette) Pontiac: (1997-2003 Bonneville, 1997-2002 Firebird, 1997-2000 Grand Am, 1997-2003 Grand Prix, 1999-2000 Montana, 1997-1999 Trans Sport) Denso Oxygen Sensors are manufactured and tested to the strictest OE standards for unparalleled performance. Each component is precision built for exact replacement, and a first time fit. This innovative line features Denso's exclusive aluminum oxide trap layer, designed to protect the ceramic element from silicone and lead poisoning for improved engine performance, greater fuel efficiency, and unparalleled longevity. Denso gives you the right part and the right fit, the first time.