Denso 234-4119 Oxygen Sensor - Upstream

Denso OE Style Oxygen Sensor 234-4119

Denso 234-4119 is an OE Style heated oxygen sensor built for specific-fit replacement on select GM, Isuzu, Saab, and Buick applications. It is engineered for upstream use and matches the original threaded mounting and 4-wire configuration for direct service on the listed vehicles.

Key Features

• OE Style replacement oxygen sensor for exact-fit service
• Heated sensor design for faster operating response
• Specific fit with a threaded mounting type
• 4-wire layout with male connector
• 18.74-inch wiring harness length
• 0.708-inch thread diameter
• Built to OE standards for consistent signal performance

OE Style Construction

The Denso OE Style line is built to match original equipment fit and function, making it a practical choice when replacing a worn upstream oxygen sensor. Denso uses precision manufacturing and testing to help ensure the sensor installs correctly the first time and performs to OE expectations. The sensor also uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management and long service life. This Denso 234-4119 oxygen sensor is a direct replacement for the listed upstream applications, including Chevrolet Colorado, GMC Canyon, and Buick Rainier.

This part cross-references Bosch 13847 and NTK 21054 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings from a failing upstream sensor
• Reduced fuel economy caused by slow or inaccurate sensor response
• Rough idle or drivability issues tied to exhaust feedback faults
• Emissions test failures caused by a degraded oxygen sensor

Installation Notes

• Fits 2004-2005 Buick Rainier, Upstream
• Fits 2004-2005 Chevrolet Colorado, Upstream
• Fits 2004-2005 Chevrolet Trailblazer, Upstream
• Fits 2004-2005 Chevrolet Trailblazer EXT, Upstream
• Fits 2004-2005 GMC Canyon, Upstream
• Fits 2004-2005 GMC Envoy, Upstream
• Fits 2004-2005 GMC Envoy XL, Upstream
• Fits 2004-2005 GMC Envoy XUV, Upstream
• Fits 2004-2005 Isuzu Ascender, Upstream
• Fits 2005 Saab 9-7x, Upstream
• Fits 2004 Oldsmobile Bravada, Upstream

Verify connector style, thread size, and upstream location before installation. Use the vehicle’s original routing and mounting points to avoid harness strain and ensure proper sensor placement in the exhaust stream.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for fit, function, and durability. The OE Style design is intended to deliver the correct replacement part for the listed applications, including Chevrolet Colorado, GMC Canyon, and Buick Rainier models.