Denso 234-8054 Oxygen Sensor - Downstream or Upstream

Denso OE-Style Oxygen Sensor 234-8054

Denso 234-8054 is an OE-style narrow-band oxygen sensor built for direct replacement on select GM applications. It uses a specific-fit, 4-wire design with a 12.40-inch wiring harness for a factory-style connection and accurate signal response.

Designed for vehicles such as the Chevrolet Silverado 1500, GMC Sierra 1500, and Cadillac XT5, this sensor supports proper air-fuel feedback in upstream and downstream locations where listed.

Key Features

• OE-style replacement oxygen sensor for direct-fit service
• Narrow-band sensor type for factory-style signal output
• Specific fit for listed vehicle applications
• 4-wire design with 12.40-inch wiring harness length
• Built to Denso OE standards for replacement accuracy
• 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 fitment and consistent performance. The 234-8054 is manufactured and tested to OE-level standards, with attention to connector fit, harness length, and sensor response. Its protective trap layer is intended to help preserve the sensing element under demanding exhaust conditions, supporting stable engine operation and fuel control.

This part cross-references Bosch 16552 for the same application. It also replaces select OE and aftermarket references including 21079 and 2348054.

What It Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from a worn sensor
• Reduced fuel economy caused by slow or inaccurate sensor response
• Rough idle or drivability issues tied to exhaust feedback faults
• Failed emissions testing caused by sensor degradation

Installation Notes

Verify the vehicle’s year, make, model, and sensor position before installation. This part fits 2018-2023 Buick Enclave, upstream; 2021-2023 Cadillac Escalade, downstream; 2017-2023 Cadillac XT5, upstream; 2019-2023 Chevrolet Silverado 1500, downstream; 2021-2023 GMC Yukon, downstream; and other listed GM applications. Confirm connector style and harness routing against the original sensor before replacement.

For fitment-based searches, this part is commonly selected for Chevrolet Silverado 1500 downstream oxygen sensor replacement, GMC Sierra 1500 downstream oxygen sensor replacement, and Cadillac XT5 upstream oxygen sensor service.

Quality Assurance

Denso manufactures this oxygen sensor to strict OE standards and tests it for replacement accuracy and first-time fit. The OE-style design and contamination-resistant sensing element support consistent service on listed Buick, Cadillac, Chevrolet, and GMC applications.