Denso 234-8000 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-8000

Denso 234-8000 is an OE Style heated oxygen sensor built for specific-fit replacement on select Toyota, Mazda, and Scion applications. It is engineered for direct replacement service where accurate exhaust feedback, stable drivability, and proper emissions system operation matter.

For drivers searching for a downstream oxygen sensor for 2016-2018 Mazda CX-3, 2016-2018 Mazda MX-5 Miata, or 2017-2018 Toyota Yaris iA, this Denso oxygen sensor is matched to the listed applications and connector style.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for direct replacement on listed vehicles
• 4-wire configuration with female connector
• Threaded mounting with 0.709 in. thread diameter
• 16.14 in. wiring harness length for application-specific routing
• OE Style construction for factory-type fit and function

OE Style Construction

Denso’s OE Style line is built to match original equipment requirements for fit, electrical connection, and sensor performance. The sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting consistent exhaust monitoring and long service life. This part number, 234-8000, is a direct replacement choice for downstream sensor service on the listed Toyota Yaris, Mazda CX-3, Mazda MX-5 Miata, Toyota Yaris iA, and Scion iA applications.

This part cross-references NTK 24788 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel feedback from a worn downstream sensor
• Reduced fuel economy caused by inaccurate exhaust readings
• Emissions test failures tied to sensor response issues
• Rough or inconsistent engine operation from degraded sensor output

Installation Notes

Verify the connector, thread size, and downstream location before installation. Use the vehicle’s original routing path for the 16.14 in. harness and confirm the sensor is installed in the threaded mounting point specified for the application. For fitment, this part is listed for 2019 Toyota Yaris, downstream; 2016-2018 Mazda CX-3, downstream; 2016-2018 Mazda MX-5 Miata, downstream; 2017-2018 Toyota Yaris iA, downstream; and 2016 Scion iA, downstream.

Quality Assurance

Denso manufactures and tests these oxygen sensors to OE standards for replacement accuracy and consistent performance. The OE Style design is intended to deliver the right fit and function for the listed applications, with Denso’s contamination-resistant sensor protection built into the design.