Denso 234-9112 Air / Fuel Ratio Sensor - Upstream

Denso OE Style Air/Fuel Ratio Sensor

Denso 234-9112 is an OE Style heated air/fuel ratio sensor built for specific-fit replacement on select Toyota, Scion, and Lexus applications. It is engineered for upstream use and is a direct-match option for drivers needing accurate fuel-trim feedback on vehicles such as the Toyota Prius, Corolla, and Lexus CT200h.

Key Features

• OE Style replacement for precise fit and function
• Heated sensor design for faster operating temperature
• Specific fit application for direct replacement
• 4-wire configuration
• Wiring harness length: 14.76
• Regular grade type for everyday service replacement

Product Details

Denso 234-9112 is manufactured and tested to OE standards, with each component precision-built for exact replacement and first-time fit. As an upstream air/fuel ratio sensor, it helps the engine control system monitor exhaust oxygen content and maintain proper air-fuel balance. This part is a strong match for fitment-based searches such as Toyota Prius upstream air/fuel ratio sensor, Scion xD upstream sensor replacement, and Lexus CT200h OE style A/F sensor. This part cross-references NTK 24828 for the same application.

Vehicle Fitment

• Fits 2012-2015 Scion iQ, Upstream
• Fits 2011-2014 Lexus CT200h, Upstream
• Fits 2010-2014 Scion xD, Upstream
• Fits 2011-2014 Toyota Matrix, Upstream
• Fits 2011-2014 Toyota Prius, Upstream
• Fits 2012-2014 Toyota Prius Plug-In, Upstream
• Fits 2012-2014 Toyota Prius V, Upstream
• Fits 2011-2013 Toyota Corolla, Upstream, North American Built

Common Replacement Reasons

• Check engine light related to air/fuel ratio sensor performance
• Rough idle or inconsistent fuel control
• Reduced fuel economy from inaccurate sensor feedback
• Slow sensor response during closed-loop operation
• Failed emissions inspection tied to upstream sensor faults

Installation Notes

Confirm the upstream sensor location before ordering, since this part is specific to the listed applications. Verify connector style, harness routing, and OE part number match before installation. For best results, inspect the exhaust threads and surrounding wiring during replacement on Toyota Prius, Corolla, and Scion xD applications.

Quality Assurance

Denso builds this OE Style sensor to strict original-equipment standards and tests it for replacement accuracy and fit. The design focus is on correct application matching and dependable sensor performance for the listed Toyota, Scion, and Lexus vehicles.