Denso 234-4563 Oxygen Sensor - Upstream

Denso OE Style Oxygen Sensor 234-4563

Denso 234-4563 is an OE Style heated oxygen sensor built for specific-fit replacement on select Chevrolet Silverado HD and GMC Sierra HD applications. It is engineered to match factory fitment and signal requirements for upstream sensor locations, helping restore accurate exhaust feedback for the engine management system.

Key Features

• OE Style replacement oxygen sensor for direct-fit service
• Heated sensor design for faster operating temperature
• Specific fit with 4-wire, male connector configuration
• Threaded mounting with 0.708 in. thread diameter
• 14.76 in. wiring harness length for application-specific routing
• Built with Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

Product Details

Denso 234-4563 is manufactured and tested to OE standards for precise replacement on upstream positions in heavy-duty GM trucks. It is listed for 2011-2015 Chevrolet Silverado 2500 HD, 2012-2015 Chevrolet Silverado 3500 HD, 2012-2015 GMC Sierra 2500 HD, 2012-2015 GMC Sierra 3500 HD, and 2012 Chevrolet Suburban 2500, with additional 2011 Silverado and Sierra HD coverage in OE-style upstream applications. This part cross-references Bosch 15283 and Delphi ES20009 for the same application.

What It Helps Address

• Check engine light caused by a failing upstream oxygen sensor
• Incorrect air-fuel feedback to the engine control module
• Reduced fuel economy from inaccurate exhaust readings
• Slow sensor response during closed-loop operation
• Driveability issues related to worn or contaminated oxygen sensor elements

Installation Notes and Tips

Verify the connector style, thread size, and upstream location before installation. This sensor uses a threaded mount and a 4-wire male connector, so matching the factory harness and exhaust bung is important for proper fit. For best results, compare the vehicle’s original sensor routing and connector orientation before replacement. Compatible with select Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD upstream applications.

Quality Assurance

Denso builds this OE Style oxygen sensor to strict factory-level standards and tests each component for replacement accuracy and first-time fit. The design includes contamination protection for the sensing element, supporting long service life in demanding exhaust conditions.