O2 Oxygen Sensor Replacement 4pc Set for GM Vehicles (2000-2004)

Replace all four oxygen sensors on your 2000-2005 GM vehicle with this complete set—engineered to eliminate persistent check engine lights, restore lost fuel economy, and fix the P0420/P0430 codes common on early 2000s models.

Fix the Check Engine Light on Early 2000s GM Vehicles

If you're fighting a persistent check engine light on your 2000-2005 GM vehicle—Chevrolet, GMC, Buick, Pontiac, Oldsmobile, Cadillac, Isuzu, or Honda Passport—oxygen sensors are likely the culprit. Research confirms faulty O2 sensors trigger codes like P0420 (catalyst efficiency below threshold) and P0171/P0174 (fuel system too lean) that account for a significant portion of check engine light issues on these models. Symptoms include noticeably decreased fuel mileage, rough idle, hesitation during acceleration, rotten egg smell from the exhaust, and failed emissions tests. Many owners report needing sensor replacement around 100,000-120,000 miles, with the upstream sensors (before the catalytic converter) being particularly important for fuel economy and engine performance.

This complete 4-sensor pack provides comprehensive coverage for GM's 3.1L, 3.4L, 3.5L V6 engines and 4.3L, 4.6L, 4.8L, 5.3L V8 engines used across multiple platforms from 2000-2005. The direct plug-in design with factory-style 4-wire heated configuration means no splicing or adapters—just disconnect the old sensors, thread in the new ones, and reconnect the wiring. Each sensor is built and tested to strict quality control standards, restoring your engine's air-fuel ratio monitoring to bring back smooth idle, proper fuel economy, and eliminate those frustrating P0420/P0430 codes. The 4-pack gives you coverage for complete replacement—most GM V6 and V8 models from this era have four sensors (upstream and downstream, bank 1 and bank 2).

Key Features

• Complete 4-Pack Coverage: Replace all oxygen sensor positions in one purchase—covers both upstream and downstream, bank 1 and bank 2
• Direct Plug-In Replacement: Factory-style 4-wire heated configuration with pre-attached connectors—no splicing required
• OE Interchange Compatibility: Replaces part number 234-4647 across multiple GM platforms and engine sizes
• Quality Control Tested: Each sensor built and tested to strict standards for reliable performance
• Restores Fuel Economy: Properly functioning O2 sensors can restore 10-15% fuel economy lost to sensor degradation

Extensive GM Fitment (2000-2005)

Buick: Century 3.1L V6 (2001-05) • Rainier 5.3L V8 (2004) • Rendezvous 3.4L V6 (2002-05)

Cadillac: DeVille 4.6L V8 (2000-04) • Eldorado 4.6L V8 (2000-02) • Seville 4.6L V8 (2000-03)

Chevrolet: Astro 4.3L V6 (2000-02) • Avalanche 1500 5.3L V8 (2002 Canada) • Blazer S10 4.3L V6 (2002-05) • Impala 3.4L V6 (2001-05) • Malibu 3.1L V6 (2001-03) • Monte Carlo 3.4L V6 (2001-04) • S10 Pickup 4.3L V6 (2002-04) • Silverado 1500/2500 4.3L/4.8L/5.3L (2000-02) • SSR 5.3L V8 (2003-04) • Suburban 1500 5.3L V8 (2000-02 Canada) • Tahoe 4.8L/5.3L V8 (2000-02) • Trailblazer EXT 5.3L V8 (2003-04) • Venture 3.4L V6 (2002-05)

GMC: Envoy XL 5.3L V8 (2003-04) • S-15 Sonoma 4.3L V6 (2002-04) • Safari 4.3L V6 (2000-02) • Sierra 1500/2500 4.3L/4.8L/5.3L (2000-02) • Yukon 4.8L/5.3L V8 (2000-02) • Yukon XL 1500 5.3L V8 (2000-02 Canada)

Honda: Passport 3.2L V6 (2002)

Isuzu: Ascender 5.3L V8 (2003-04) • Axiom 3.5L V6 (2004) • Rodeo 3.2L/3.5L V6 (2002-04) • Rodeo Sport 3.2L V6 (2002-03)

Oldsmobile: Alero 3.4L V6 (2001-04) • Aurora 3.5L V6/4.0L V8 (2001-03) • Intrigue 3.5L V6 (2000-02) • Silhouette 3.4L V6 (2001-04)

Pontiac: Aztek 3.4L V6 (2001-05) • Grand Am 3.4L V6 (2001-05) • Grand Prix 3.1L V6 (2001-03) • Montana 3.4L V6 (2001-05)

Important Notes: Some Canadian-built models (1st VIN digit "2") have specific fitment requirements. Verify your VIN before ordering. Includes both upstream (pre-catalytic converter) and downstream (post-catalytic converter) sensor positions.

Package Includes: 4x heated oxygen sensors (4-wire configuration), factory-style electrical connectors pre-attached, OE interchange part number 234-4647 compatibility.