Denso 234-4505 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4505

Denso 234-4505 is an OE Style heated oxygen sensor built for direct replacement on select Mazda applications. It is engineered for a specific fit and uses a 4-wire, threaded design with a male connector for straightforward sensor replacement.

For drivers searching for a downstream oxygen sensor for 2011-2015 Mazda 3, Mazda 3 Sport, or Mazda 5, this Denso unit is built to match the original sensor layout and connection style.

Key Features

• OE Style replacement oxygen sensor for direct-fit service
• Heated sensor design for faster operating response
• Specific fit application for select Mazda vehicles
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 thread diameter
• Wiring harness length: 15.83

Product Details

Denso 234-4505 is a downstream oxygen sensor designed to replace the original sensor on select Mazda 3, Mazda 3 Sport, and Mazda 5 models. Denso builds and tests its OE Style sensors to strict original-equipment standards, with precision construction for exact replacement fitment. The sensor also uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management and long service life.

This part cross-references Mazda L5D91886ZC and NTK 24460 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings from a worn downstream sensor
• Reduced fuel economy caused by inaccurate exhaust feedback
• Slow sensor response after heat cycling or contamination
• Emissions system faults tied to the downstream sensor circuit

Installation Notes

Fits 2012-2015 Mazda 5, downstream. Fits 2012-2013 Mazda 3, downstream. Fits 2012-2013 Mazda 3 Sport, downstream. Fits 2011 Mazda 3, downstream, US & Canada; OE Style.

Confirm connector style, thread size, and downstream location before installation. Use the vehicle’s original routing and mounting points to avoid strain on the harness and ensure proper sensor placement.

Quality Assurance

Denso manufactures this OE Style oxygen sensor to original-equipment standards and tests each component for precise fit and reliable operation. The design focuses on accurate replacement fitment, contamination resistance, and consistent performance in the exhaust stream.