Denso 234-4285 Oxygen Sensor - Downstream, Downstream Right or Upstream Right

OE-Style Oxygen Sensor for Precise Replacement

This Denso OE Style oxygen sensor is built for direct replacement on select Chevrolet, GMC, Buick, Pontiac, Isuzu, Saab, and Oldsmobile applications. With a heated, specific-fit design and threaded mounting, it is engineered for accurate exhaust feedback and a first-time fit on vehicles such as the Chevrolet Malibu, GMC Envoy, and Chevrolet Trailblazer.

Key Features

• Heated oxygen sensor with a specific-fit design
• 4-wire configuration with a female connector
• Threaded mounting type for OE-style installation
• Wiring harness length: 13.19 in.
• Thread diameter: 0.708 in.
• Built to OE standards for direct replacement fitment
• Part number: 234-4285

OE-Style Construction and Fit

Denso 234-4285 is part of the OE Style line, which focuses on exact replacement fit and factory-style performance. The sensor uses a precision-built heated design to help maintain stable exhaust readings during warm-up and normal driving. Denso also incorporates an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting consistent engine operation and long service life. This part cross-references Bosch 15129 and NTK 21044 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light caused by a failing downstream or upstream oxygen sensor
• Rough idle or inconsistent air-fuel feedback
• Reduced fuel economy from inaccurate exhaust readings
• Emissions test failures tied to sensor response issues
• Slow sensor switching or degraded heater performance

Installation Notes and Fitment

Fits 2006-2008 Chevrolet Malibu, downstream. Fits 2007 Chevrolet Express 1500, upstream right and downstream right, excluding California. Fits 2004-2007 Chevrolet Express 2500, upstream right and downstream right. Fits 2004-2007 Chevrolet Express 3500, upstream right and downstream right. Fits 2007 GMC Savana 1500, upstream right and downstream right, excluding California. Fits 2004-2007 GMC Savana 2500, upstream right and downstream right. Fits 2004-2007 GMC Savana 3500, upstream right and downstream right. Fits 2006-2007 Pontiac G6, downstream. Fits 2006 Buick Rainier, downstream. Fits 2004-2006 Chevrolet Express 1500, upstream right and downstream right. Fits 2006 Chevrolet SSR, downstream. Fits 2006 Chevrolet Trailblazer, downstream. Fits 2006 Chevrolet Trailblazer EXT, downstream. Fits 2006 GMC Envoy, downstream. Fits 2006 GMC Envoy XL, downstream. Fits 2004-2006 GMC Savana 1500, upstream right and downstream right. Fits 2006 Isuzu Ascender, downstream. Fits 2006 Saab 9-7x, downstream. Fits 2004-2005 Buick Rainier, downstream. Fits 2004-2005 Chevrolet Colorado, downstream. Fits 2004-2005 Chevrolet Malibu, downstream. Fits 2002-2005 Chevrolet Trailblazer, downstream. Fits 2002-2005 Chevrolet Trailblazer EXT, downstream. Fits 2004-2005 GMC Canyon, downstream. Fits 2002-2005 GMC Envoy, downstream. Fits 2002-2005 GMC Envoy XL, downstream. Fits 2004-2005 GMC Envoy XUV, downstream. Fits 2003-2005 Isuzu Ascender, downstream. Fits 2005 Saab 9-7x, downstream. Fits 2002-2004 Oldsmobile Bravada, downstream. Fits 2003 Chevrolet Express 1500, upstream right and downstream right, with 13 in. right upstream and downstream sensors. Fits 2003 Chevrolet Express 2500, upstream right and downstream right, with 13 in. right upstream and downstream sensors. Fits 2003 Chevrolet Express 3500, upstream right and downstream right, with 13 in. right upstream and downstream sensors. Fits 2003 GMC Savana 1500, upstream right and downstream right, with 13 in. right upstream and downstream sensors. Fits 2003 GMC Savana 2500, upstream right and downstream right, with 13 in. right upstream and downstream sensors. Fits 2003 GMC Savana 3500, upstream right and downstream right, with 13 in. right upstream and downstream sensors.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for direct-fit replacement performance. The OE Style line is designed to deliver the correct part and fit for the listed Chevrolet Malibu, GMC Envoy, and Chevrolet Trailblazer applications, with factory-style connector and mounting details.