Denso 234-9004 Air / Fuel Ratio Sensor - Upstream
OE Quality 60-Day Returns
Denso
 OE Style

Denso 234-9004 Air / Fuel Ratio Sensor - Upstream

Brand Denso 234-9004
Position Upstream
Connector Gender Male
Grade Type Regular
Sensor Type Heated
Thread Diameter 0.711
Universal Or Specific Fit Specific
Wire Quantity 4
Wiring Harness Length 10.24
Product line OE Style
Fits Honda and Acura · 7 vehicles

OE-style replacement. Precision-built for an exact, first-time fit.

Heated sensor. Helps maintain accurate air-fuel ratio monitoring.

Specific fit. Made to match the part application precisely.

Cross-references ACDelco 213-2852, BorgWarner OS1663 and Bosch 13680 for the same application. See all 9.

$225.92Free shipping
In stock · usually ships same day before 1pm CST
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Step 2 — Quantity
Order total $225.92
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Air / Fuel Ratio Sensor options

Denso OE Style Air/Fuel Ratio Sensor

Denso 234-9004 is an OE Style heated air/fuel ratio sensor built for precise replacement and a first-time fit. It is a specific-fit sensor for 2002-2005 Honda Civic upstream applications and 2002-2004 Acura RSX upstream applications.

Key Features

  • Heated air/fuel ratio sensor for upstream placement
  • Specific-fit design for direct replacement on listed vehicles
  • 4-wire configuration with male connector
  • 10.24 in. wiring harness length
  • Thread diameter: 0.711
  • OE Style construction for accurate fit and sensor replacement

Product Details

The Denso OE Style line focuses on exact replacement parts built to match original equipment standards. This Denso 234-9004 air/fuel ratio sensor is manufactured and tested for consistent fitment and dependable signal performance in the exhaust stream. It is a direct-fit option for drivers servicing a Honda Civic upstream air fuel ratio sensor or an Acura RSX upstream oxygen sensor location where OE-style replacement is required. This part cross-references Bosch 13680 and NTK 24665 for the same application.

Common Issues It May Address

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

Installation Notes and Tips

Verify the connector style, wire count, and thread diameter before installation. This sensor is specific fit and intended for upstream placement on the listed Honda Civic and Acura RSX applications. Confirm the harness routing and sensor location match the original part before final tightening to help ensure proper installation.

Quality Assurance

Denso manufactures this OE Style sensor to strict original-equipment standards and tests each component for replacement accuracy and first-time fit. The part number 234-9004 is engineered as a direct replacement for the listed applications, with the right fit for the right vehicle the first time.

Related reading

This part fits 7 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelTransmissionPositionNotes
2005HondaCivic—UpstreamOE Style
2004AcuraRSXManualUpstreamOE Style
2004HondaCivic—UpstreamOE Style
2003AcuraRSXManualUpstreamOE Style
2003HondaCivic—UpstreamOE Style
2002AcuraRSXManualUpstreamOE Style
2002HondaCivic—UpstreamOE Style
Directly replaces or cross-references 9 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 213-2852BorgWarner — OS1663Bosch — 13680Delphi — ES10937Honda — 36531PNDA11NTK — 24665Standard Ignition — SG1845Walker Products — 250-54076Walker Products — 350-64011