Denso 234-4294 Oxygen Sensor - Downstream

OE-Style Downstream Oxygen Sensor

This Denso oxygen sensor is an OE Style, specific-fit replacement built for downstream applications on select GM, Saturn, Saab, Isuzu, Buick, Chevrolet, GMC, Hummer, and Pontiac vehicles. Part number 234-4294 is engineered for direct replacement fitment and accurate exhaust monitoring in the 2007-2012 model years listed below.

Key Features

• Heated oxygen sensor with a specific-fit design
• 4-wire configuration with a female connector
• Threaded mounting type with 0.708 in. thread diameter
• 14.76 in. wiring harness length for OE-style routing
• Built to strict OE standards for replacement fit and function
• Uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

Product Details

Denso OE Style oxygen sensors are manufactured and tested to OE-level standards for direct replacement use. This downstream sensor is designed to match the original fit and electrical layout, helping maintain proper exhaust feedback for vehicles such as the Chevrolet Colorado, GMC Canyon, and Hummer H3. The Denso 234-4294 is also listed for applications including the Buick Enclave, Chevrolet Malibu, GMC Acadia, Saturn Aura, and Pontiac G6, making it a practical OE-style choice for a wide range of late-2000s platforms.

This part cross-references Bosch 15113 and NTK 21058 for the same application.

What This Sensor Helps Address

• Check engine light concerns related to downstream oxygen sensor faults
• Incorrect exhaust oxygen readings after sensor aging or contamination
• Rough emissions monitoring performance caused by a failing heated sensor
• OE connector or thread mismatch when replacing the original sensor
• Fuel economy loss tied to inaccurate exhaust feedback

Installation Notes and Fitment

Fits 2007-2012 Chevrolet Colorado, downstream. Fits 2007-2012 GMC Canyon, downstream. Fits 2007-2010 Hummer H3, downstream. Fits 2009-2010 Hummer H3T, downstream. Fits 2007-2009 Chevrolet Trailblazer, downstream. Fits 2007-2009 GMC Envoy, downstream. Fits 2007-2009 Saab 9-7x, downstream. Fits 2008-2009 Saturn Vue, downstream. Fits 2008 Buick Enclave, downstream. Fits 2008 Chevrolet Malibu, downstream. Fits 2007-2008 GMC Acadia, downstream. Fits 2007-2008 Isuzu Ascender, downstream. Fits 2007-2008 Isuzu i-290, downstream. Fits 2007-2008 Isuzu i-370, downstream. Fits 2008 Pontiac G6, downstream, 1st design; downstream sensor marked 12597947. Fits 2007-2008 Saturn Aura, downstream, 1st design; downstream sensor marked 12597947. Fits 2007-2008 Saturn Outlook, downstream. Fits 2007 Buick Rainier, downstream.

Verify the connector style, thread diameter, and downstream sensor location before installation. This OE-style replacement is intended for direct-fit service on the listed applications, including Chevrolet Colorado, GMC Canyon, and Saturn Aura models.

Quality Assurance

Denso manufactures this oxygen sensor to strict OE standards and tests each component for replacement accuracy and first-time fit. The aluminum oxide trap layer is part of the sensor design to help protect the sensing element from contamination and support long service life in demanding exhaust environments.