Denso 234-9117 Air / Fuel Ratio Sensor - Upstream

Denso OE Style Air/Fuel Ratio Sensor

Denso 234-9117 is an OE Style heated air/fuel ratio sensor built for specific-fit replacement on select Honda and Acura applications. It is engineered for exact replacement fitment and consistent signal performance in upstream emission control locations.

Key Features

• Heated air/fuel ratio sensor for upstream placement
• Specific-fit design for direct replacement on listed vehicles
• 4-wire configuration with a 10.91 in. wiring harness length
• Regular grade type for OE-style service replacement
• Built and tested to OE standards for fit and function

Product Details

The Denso OE Style line focuses on direct-replacement sensors that match original equipment requirements for form, fit, and electrical performance. Part number 234-9117 is made for select Honda CR-Z, Civic, Fit, and Insight models, as well as Acura ILX applications, all in the upstream position. If you are searching for a Honda Civic upstream air/fuel ratio sensor or a Denso 234-9117 replacement for an Acura ILX, this sensor is built for that exact service need.

This part cross-references Honda OE numbers 36531RE0003 and 36531RW0A01 for the same application. It also cross-references NTK 25680 and Walker Products 250-54111 for select applications.

What It Helps Address

• Check engine light related to air/fuel ratio sensor performance
• Incorrect upstream sensor readings affecting fuel control
• Rough idle or drivability concerns tied to mixture feedback
• Emission test failures caused by sensor response issues
• Replacement needs after sensor aging or contamination

Installation Notes

• Verify the connector, wire count, and harness length before installation.
• Confirm upstream placement on the vehicle before ordering.
• Inspect the exhaust and wiring route for damage that could affect the new sensor.
• Clear diagnostic trouble codes after installation and confirm proper operation with a scan tool.

Quality Assurance

Denso manufactures and tests these sensors to OE standards for replacement accuracy and first-time fit. The OE Style product line is intended to deliver the same type of direct-fit service expected from original equipment components.