Denso 234-4975 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor for Verano

The Denso 234-4975 is a heated oxygen sensor built to OE-style specifications for direct replacement on select applications. It is engineered for the 2015-2017 Buick Verano downstream position and is designed for accurate exhaust monitoring, stable signal response, and a precise first-time fit.

Denso’s OE Style line focuses on exact replacement fitment and factory-level construction. This oxygen sensor uses a specific-fit design with a 17.28-inch wiring harness and 4-wire heated configuration, making it a direct-match option for downstream service on the Buick Verano.

Key Features

• OE Style replacement oxygen sensor for direct-fit service
• Heated sensor design for faster operating readiness
• Specific-fit application for the downstream position
• 17.28-inch wiring harness length
• 4-wire configuration for the listed vehicle application
• Built to strict OE standards for replacement accuracy
• Includes Denso’s aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination

Detailed Description

Denso 234-4975 is an OE-style downstream oxygen sensor for the 2015, 2016, and 2017 Buick Verano. It is manufactured and tested to OE-level standards and built for exact replacement fitment, which helps reduce installation issues on the listed application. The heated sensor design supports quicker sensor operation after startup, while the specific-fit harness and 4-wire layout match the vehicle’s original configuration. This part cross-references GMC 12658647 for the same application.

The Denso OE Style product line is aimed at direct replacement service where factory-style fit, connector layout, and sensor performance matter. For buyers searching for a 2015-2017 Buick Verano downstream oxygen sensor or Denso 234-4975 oxygen sensor replacement, this part provides a vehicle-specific solution rather than a universal sensor.

Common Issues This Part May Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect exhaust oxygen readings from a worn sensor
• Reduced fuel economy caused by inaccurate sensor feedback
• Slow sensor response after warm-up
• Fitment problems from using a non-specific replacement sensor

Installation Notes and Tips

Confirm the downstream sensor location before ordering and compare the connector, wire count, and harness length to the original part. For best results, inspect the exhaust threads and wiring routing before installation, and clear diagnostic trouble codes after the repair if required by the vehicle system. This part is listed for the downstream position on the 2015-2017 Buick Verano.

Quality Assurance

Denso manufactures this oxygen sensor to strict OE standards and tests it for replacement accuracy and fit. The sensor’s protective trap layer is designed to help shield the ceramic element from contamination that can shorten service life and affect engine management performance.