Denso 234-4343 Oxygen Sensor - Downstream or Upstream

Denso OE Style Oxygen Sensor 234-4343

Denso 234-4343 is an OE Style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for specific applications across Buick, Chevrolet, GMC, and Pontiac models, including 2005 Buick Century, 2005 Chevrolet Impala, and 2003-2005 GMC Jimmy.

Key Features

• Heated oxygen sensor with specific fitment for direct replacement
• OE Style design for factory-like fit and connector alignment
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• 12.28 in. wiring harness length for application-specific routing
• Built to strict OE standards for consistent sensor performance
• Uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

OE Style Design Details

Denso’s OE Style line focuses on direct-fit replacement parts that match original equipment dimensions and electrical requirements. The 234-4343 oxygen sensor is precision built for specific applications, helping maintain proper exhaust feedback for engine management systems. This part cross-references Bosch 15896 and NTK 21516 for the same application.

Vehicle Fitment

• Fits 2005 Buick Century, Upstream, OE Style
• Fits 2005 Buick Rendezvous, Upstream, OE Style
• Fits 2003-2005 Chevrolet Blazer, Upstream, OE Style
• Fits 2003-2005 Chevrolet Blazer, Downstream, OE Style
• Fits 2005 Chevrolet Impala, Upstream, OE Style
• Fits 2005 Chevrolet Monte Carlo, Upstream, OE Style
• Fits 2003-2005 GMC Jimmy, Upstream, OE Style
• Fits 2003-2005 GMC Jimmy, Downstream, OE Style
• Fits 2005 Pontiac Aztek, Upstream, OE Style
• Fits 2005 Pontiac Grand Am, Upstream, OE Style
• Fits 2005 Pontiac Montana, Upstream, OE Style
• Fits 2003-2004 Chevrolet S10, Upstream, OE Style
• Fits 2003-2004 Chevrolet S10, Downstream, OE Style
• Fits 2003-2004 GMC Sonoma, Upstream, OE Style
• Fits 2003-2004 GMC Sonoma, Downstream, OE Style

Common Issues This Sensor Can Address

• Faulty oxygen sensor readings that trigger check engine light concerns
• Rich or lean fuel mixture issues caused by inaccurate exhaust feedback
• Reduced fuel economy from a slow or contaminated sensor
• Driveability problems related to improper air-fuel control
• Emission test failures tied to sensor performance degradation

Installation Notes and Tips

Confirm upstream or downstream placement before ordering, since this part is listed for both positions on select vehicles. Match the 4-wire connector, threaded mount, and harness length to the original sensor before installation. For best results, inspect the exhaust bung and wiring route for heat damage or corrosion before replacing the sensor.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for consistent fit and performance. The OE Style construction is intended to deliver the right part and the right fit for the listed Buick, Chevrolet, GMC, and Pontiac applications.