Denso 234-4673 Oxygen Sensor - Downstream Left or Upstream

Denso OE Style Oxygen Sensor 234-4673

Denso 234-4673 is an OE-style heated oxygen sensor built for specific applications that require a direct-fit replacement with the correct connector, thread size, and harness length. It is engineered for upstream and downstream left positions on select Buick, Chevrolet, GMC, Cadillac, Pontiac, Saturn, and Saab vehicles.

Key Features

• Heated oxygen sensor with specific fitment for direct replacement
• OE Style design for the correct sensor shape, connector, and mounting interface
• 4-wire configuration with male connector
• Threaded mounting with 0.708 in. thread diameter
• 21.65 in. wiring harness length for application-specific routing
• Built to OE standards with an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

Fitment and Application

This Denso oxygen sensor fits 2011-2017 Buick Regal, upstream; 2012-2017 Buick Verano, upstream; 2015-2017 Chevrolet Equinox, upstream; 2016-2017 GMC Terrain, upstream; 2010-2016 Buick LaCrosse, upstream; 2014 Chevrolet Impala, upstream; 2009-2014 Chevrolet Malibu, upstream; 2011 Saab 9-5, upstream; 2010 Buick Allure, upstream; 2007-2010 Cadillac STS, upstream; 2007-2009 Cadillac SRX, upstream; 2009 Pontiac G6, upstream; 2009 Saturn Aura, upstream; and 2003-2007 GM truck applications in the downstream left position, including Chevrolet Silverado, Suburban, Avalanche, and GMC Sierra/Yukon XL models listed for this part.

This part cross-references Bosch 15114 and NTK 21555 for the same application.

Detailed Description

Denso 234-4673 is designed as a direct OE-style replacement for vehicles that rely on accurate exhaust oxygen feedback for fuel control and emissions monitoring. The heated sensor helps the engine control module reach operating temperature faster, while the specific-fit design supports proper installation on the listed upstream and downstream left locations. For shoppers searching for a Buick Regal oxygen sensor, Chevrolet Malibu upstream O2 sensor, or GMC Terrain replacement sensor, this part matches the application details needed for a correct repair.

What It Helps Address

• Check engine light caused by oxygen sensor circuit or response faults
• Rough idle or drivability issues related to incorrect air-fuel feedback
• Reduced fuel economy from a slow or inaccurate sensor signal
• Emissions test failures tied to sensor performance
• Contamination-related sensor degradation from silicone or lead exposure

Installation Notes and Tips

Confirm the vehicle year, make, model, and sensor position before ordering. This is a specific-fit, threaded sensor with a male connector, so match the connector style, wire count, and harness length to the original part. On vehicles such as the Buick LaCrosse, Chevrolet Equinox, and GMC Terrain, verify whether the application calls for an upstream or downstream left sensor before installation.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for exact replacement fit and consistent performance. The OE-style construction and contamination-resistant design support reliable operation in the listed applications.