Denso 234-8082 Oxygen Sensor - Downstream

Denso OE-Style Oxygen Sensor for Mazda

Denso 234-8082 is an OE-style narrow-band oxygen sensor built for specific-fit replacement on select Mazda CX-5 and CX-9 applications. It is designed for downstream placement and uses a threaded mounting style with a 4-wire female connector for direct replacement service.

Denso’s oxygen sensor line is built and tested to OE standards, with precision construction for accurate fitment and consistent signal performance. The brand’s aluminum oxide trap layer helps protect the ceramic sensing element from silicone and lead contamination, supporting stable engine operation and long service life.

Key Features

• OE-style oxygen sensor for specific-fit replacement
• Narrow-band sensor type for downstream exhaust monitoring
• 4-wire design with female connector
• Threaded mounting for secure installation
• 25.47 in. wiring harness length
• Built to Denso OE standards for exact replacement fit

Detailed Product Overview

This Denso oxygen sensor, part number 234-8082, is a direct-fit emission control sensor for Mazda CX-5 and Mazda CX-9 downstream applications. It is engineered for vehicles that require a narrow-band sensor and a specific-fit threaded design, helping maintain proper exhaust feedback in the engine management system. If you are replacing a worn Mazda CX-5 downstream oxygen sensor or sourcing a Denso 234-8082 replacement for a Mazda CX-9, this OE-style part is built for the application.

This part cross-references Gates 24792 for the same application.

Vehicle Fitment

• Fits 2013-2016 Mazda CX-5, downstream.
• Fits 2019-2024 Mazda CX-5, downstream.
• Fits 2019-2023 Mazda CX-9, downstream.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect exhaust oxygen readings affecting fuel control
• Reduced fuel economy caused by a failing sensor signal
• Rough or inconsistent engine performance from aged sensor output
• Contamination-related sensor degradation in the exhaust stream

Installation Notes and Tips

Confirm downstream sensor location before ordering and match the connector style, wire count, and threaded mounting configuration to the original part. Inspect the harness routing and connector condition during replacement, and verify the sensor is installed in the correct exhaust position for the vehicle application. For Mazda CX-5 and Mazda CX-9 service, use the OE-style fitment data to confirm the correct Denso 234-8082 application.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and consistent performance. The sensor design includes contamination protection for the sensing element, supporting dependable operation in demanding exhaust conditions.