Denso 234-5722 Air / Fuel Ratio Sensor - Upstream

Denso OE Style Air/Fuel Ratio Sensor 234-5722

Denso 234-5722 is an OE Style heated air/fuel ratio sensor built for specific-fit replacement in select Mazda, Toyota, and Scion applications. It is engineered to match factory-style dimensions and connector layout for a direct replacement on the upstream position.

• OE Style replacement air/fuel ratio sensor
• Heated sensor design for faster operating temperature
• Specific fit for direct application matching
• 5-wire configuration with male connector
• Wiring harness length: 24.53
• Thread diameter: 0.701

OE Style Construction

The Denso OE Style line focuses on exact replacement parts built and tested to strict original-equipment standards. For buyers searching for a Mazda CX-3 upstream air/fuel ratio sensor or a Toyota Yaris iA upstream sensor, Denso 234-5722 is built to match the factory fit and electrical configuration. This part cross-references NTK 27067 for the same application.

Vehicle Fitment

• Fits 2016-2018 Mazda CX-3, Upstream
• Fits 2017-2018 Toyota Yaris iA, Upstream
• Fits 2016 Scion iA, Upstream

What It Helps Address

• Check engine light related to air/fuel ratio sensor performance
• Incorrect upstream sensor readings
• Rough idle caused by inaccurate fuel mixture feedback
• Fuel trim issues from a worn or failing sensor
• Emissions test failures tied to sensor response problems

Installation Notes

Confirm the upstream location, connector style, wire count, and thread diameter before installation. Denso 234-5722 is a specific-fit sensor, so matching the vehicle application and sensor position is important for proper installation. Verify the harness length and connector orientation against the original part before replacement.

Quality Assurance

Denso manufactures and tests this sensor to OE-style standards for consistent replacement performance and first-time fit. The precision-built design supports accurate installation on the listed Mazda CX-3, Toyota Yaris iA, and Scion iA applications.