Denso 234-4103 Oxygen Sensor

Denso OE Style Oxygen Sensor 234-4103

Denso 234-4103 is an OE-style heated oxygen sensor built for specific-fit replacement on select GM applications. It is engineered for direct replacement, accurate signal response, and a first-time fit on vehicles such as the Chevrolet Silverado 2500 HD, GMC Sierra 3500, and Cadillac Escalade.

The OE Style line focuses on factory-style fit and function, with precision-built components that match the original sensor layout. Denso also uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine operation and consistent fuel control.

Key Features

• Heated oxygen sensor for faster operating temperature and signal readiness
• Specific-fit design for direct replacement on listed applications
• 4-wire configuration with female connector
• Threaded mounting type with 0.708 in. thread diameter
• Wiring harness length: 14.76 in.
• OE Style construction for factory-like fit and routing
• Cross-reference example: Bosch 13686

Fitment and Application Details

Fits 2008-2009 Buick Allure, downstream. Fits 2008-2009 Buick LaCrosse, downstream. Fits 2008 Pontiac Grand Prix, downstream. Fits 2002 Cadillac Escalade, upstream. Fits 2002 Cadillac Escalade EXT, upstream. Fits 2001-2002 Chevrolet Silverado 2500 HD, upstream and downstream right. Fits 2001-2002 GMC Sierra 3500, upstream and downstream right. Fits 2000 Chevrolet C2500, upstream and downstream. Fits 2000 GMC K3500, upstream and downstream.

This part number, 234-4103, also covers additional upstream and downstream GM truck and SUV applications listed in the fitment table, including Chevrolet Express 3500, Suburban 2500, GMC Yukon, and GMC Yukon XL models.

What This Oxygen Sensor Helps Address

• Check engine light concerns related to oxygen sensor performance
• Rough idle or inconsistent air-fuel feedback from a worn sensor
• Reduced fuel economy caused by inaccurate exhaust readings
• Slow sensor response during closed-loop operation
• Contamination-related sensor degradation from silicone or lead exposure

Installation Notes and Quality

Use the vehicle’s original sensor location and connector style to confirm the correct upstream, downstream, left, or right position before installation. Threaded mounting and specific-fit construction help simplify replacement on the listed Chevrolet and GMC applications, including Silverado, Sierra, and Escalade models. Verify harness length and connector orientation against the removed part to ensure proper routing.

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards for fit and performance consistency. The design is built for direct replacement and dependable operation in the applications shown above.