Denso 234-9040 Air / Fuel Ratio Sensor - Upstream

Denso OE Style Air/Fuel Ratio Sensor

The Denso 234-9040 is an OE Style heated air/fuel ratio sensor built for precise replacement and a first-time fit. It is made for the upstream position on 2003-2007 Honda Accord models, with the exact connector and harness layout needed for a direct replacement.

• OE Style replacement for accurate sensor matching
• Heated sensor design for faster operating temperature
• Specific fit for 2003-2007 Honda Accord upstream applications
• 4-wire configuration with female connector
• Wiring harness length: 16.14
• Thread diameter: 0.711

Product Details

Denso OE Style sensors are manufactured and tested to OE-level standards, with each component precision-built for exact replacement fitment. The 234-9040 air/fuel ratio sensor is designed for the upstream location on the Honda Accord, helping maintain the correct air-fuel feedback signal the engine control system relies on. This part cross-references Honda (e.g., 36531RAAA01, 36531RAAA02) for the same application.

For buyers searching for a 2003-2007 Honda Accord upstream air/fuel ratio sensor, Denso 234-9040 offers the correct OE-style configuration. It is also a strong match for shoppers comparing Denso 234-9040 against other reference numbers in the same application.

Common Issues This Sensor Can Address

• Check engine light related to air/fuel ratio sensor performance
• Rough idle or inconsistent fuel control feedback
• Reduced fuel economy caused by inaccurate sensor readings
• Slow sensor response during closed-loop operation
• Emission control faults tied to upstream sensor failure

Installation Notes and Tips

Verify the upstream sensor location before installation and confirm connector style, wire count, and thread size match the original part. On 2003-2007 Honda Accord applications, the Denso 234-9040 is a specific-fit replacement, so proper routing of the 16.14 harness length helps prevent strain or contact with hot exhaust components. Always inspect the mounting threads and electrical connector condition before final installation.

Quality Assurance

Denso manufactures this OE Style air/fuel ratio sensor to strict original-equipment standards and tests each unit for replacement accuracy and fit consistency. The goal is a direct-fit sensor that matches the original application requirements for the Honda Accord upstream position.