Denso 234-8088 Oxygen Sensor - Downstream

Denso OE-Style Downstream Oxygen Sensor

Denso Oxygen Sensor 234-8088 is an OE-style, specific-fit downstream oxygen sensor built for direct replacement on select GM trucks, SUVs, and vans. It uses a narrow-band design with a 4-wire, threaded mounting configuration and a 13.19-inch wiring harness for a precise service fit.

Designed for vehicles such as the Chevrolet Silverado 1500, GMC Sierra 1500, and Cadillac Escalade, this sensor is built to match the original application and restore accurate exhaust feedback. Denso 234-8088 is also cross-referenced to Gates 21074 and NTK 21075 for the same application.

Key Features

• OE-style oxygen sensor for downstream placement
• Specific fit for direct replacement service
• Narrow-band sensor type
• 4-wire design with male connector
• Threaded mounting type for factory-style installation
• 13.19-inch wiring harness length
• Built to OE standards for exact replacement fit
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Details

Denso’s Oxygen Sensor - OE Style line is engineered for exact replacement and first-time fitment. The sensor element is precision built to meet OE standards, and the protective aluminum oxide trap layer is designed to help shield the ceramic element from contamination that can affect sensor response, fuel control, and engine operation. For drivers servicing a Chevrolet Tahoe, GMC Yukon, or Cadillac Escalade, this downstream oxygen sensor supports accurate exhaust monitoring in the original location.

This part number, 234-8088, is listed for a wide range of 2014-2020 GM applications, including Chevrolet Silverado 1500, Silverado 2500 HD, Silverado 3500 HD, Suburban 3500 HD, Express 2500, Express 3500, Tahoe, Corvette, and GMC Sierra 1500, Sierra 2500 HD, Sierra 3500 HD, Yukon, Yukon XL, Savana 2500, and Savana 3500.

What It Helps Address

• Check engine light concerns related to downstream oxygen sensor faults
• Incorrect exhaust oxygen readings
• Rough fuel control caused by a failing sensor
• Reduced fuel efficiency from inaccurate sensor feedback
• Contamination-related sensor degradation

Installation Notes

Install as a downstream oxygen sensor in the threaded factory location. Verify connector style, wire count, and harness length before installation. Confirm vehicle application by year, make, model, and position for Chevrolet Silverado 1500, GMC Sierra 1500, Cadillac Escalade, and other listed GM platforms. Use the OE-style fitment to match the original sensor location and wiring layout.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for consistent replacement quality and fit. The 234-8088 is built as a direct-fit service part for the listed applications, with OE-style construction intended to match factory requirements.