Denso 234-4996 Oxygen Sensor - Downstream

Denso 234-4996 Oxygen Sensor Overview

The Denso 234-4996 is an OE Style heated oxygen sensor built for direct replacement in specific Toyota applications. It is engineered for the downstream position on 2015-2019 Toyota Yaris models, with a first-time fit and OE-level electrical and mechanical specifications.

For drivers searching for a 2015-2019 Toyota Yaris downstream oxygen sensor replacement, this Denso part number 234-4996 is built to match the original sensor layout and connector style.

Key Features

• OE Style direct-fit oxygen sensor for specific Toyota applications
• Heated sensor design for faster operating response
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• 16.61 in. wiring harness length for proper routing
• Built and tested to OE standards for fit and function
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Line Details

Denso OE Style sensors are positioned as direct replacement components that follow original equipment dimensions and electrical requirements. The line is focused on accurate fitment, stable sensor performance, and long service life in emissions control applications.

Detailed Description

The Denso 234-4996 oxygen sensor is a specific-fit downstream sensor for Toyota Yaris models, including 2015-2018 Toyota Yaris and 2019 Toyota Yaris. It is designed to replace the original sensor with the correct connector gender, wire count, threaded mount, and harness length needed for proper installation. This part cross-references NTK 24159 for the same application.

As an OE Style replacement, this sensor is manufactured to strict original-equipment standards and uses Denso’s protective aluminum oxide trap layer to help shield the sensing element from contamination that can affect engine performance and fuel economy. If you need a Toyota Yaris downstream oxygen sensor replacement, part number 234-4996 provides the correct fit for the listed vehicles.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect air-fuel monitoring after the catalytic converter
• Reduced fuel efficiency caused by a failing sensor
• Emissions test failures tied to oxygen sensor performance
• Rough or inconsistent engine operation from inaccurate exhaust readings

Installation Notes and Tips

Install this sensor only in the downstream position on the listed Toyota Yaris applications. Confirm the threaded mount, 4-wire connector, and harness length match the original sensor before installation. For best results, inspect the exhaust threads and connector condition during replacement, and route the harness away from heat and moving components.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to original-equipment standards for fit, function, and durability. The design focuses on accurate replacement performance and long-term resistance to contamination in emissions control service.