Denso 234-9087 Air / Fuel Ratio Sensor - Upstream
OE Quality 60-Day Returns
Denso
 OE Style

Denso 234-9087 Air / Fuel Ratio Sensor - Upstream

Brand Denso 234-9087
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 24.53
Product line OE Style
Fits Mazda · 3 vehicles

OE style. Precision-built for exact replacement and a first-time fit.

Heated sensor. Delivers fast, consistent air/fuel ratio monitoring.

Specific-fit design with a 4-wire male connector.

Cross-references Bosch 15463, Mazda L395188G1 and NTK 25686 for the same application. See all 5.

$173.22Free shipping
In stock · usually ships same day before 1pm CST
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Order total $173.22
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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

The Denso 234-9087 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 select Mazda 6 models and supports accurate air-fuel monitoring for emissions control and drivability.

  • OE Style replacement for direct-fit service
  • Heated sensor design for faster operating temperature
  • Specific fit application for cleaner installation
  • 4-wire configuration with male connector
  • 24.53 in. wiring harness length
  • Thread diameter: 0.711

Product Details

Denso manufactures this air/fuel ratio sensor to strict OE standards, with each unit precision-built for exact replacement and consistent fitment. The 234-9087 is designed for the upstream location on 2006-2008 Mazda 6 models, including California exempt parts applications for pollution-controlled vehicles in California. If you are replacing a failing Mazda 6 upstream air/fuel ratio sensor, this OE Style part number 234-9087 provides the correct form and connection style for the listed application.

This part cross-references Bosch 15463 and NTK 25686 for the same application.

Common Issues This Sensor Can Address

  • Check engine light related to air-fuel ratio sensor performance
  • Rough idle caused by inaccurate exhaust oxygen feedback
  • Fuel trim concerns from a slow or faulty upstream sensor
  • Emissions test failure tied to sensor response issues
  • Poor drivability from incorrect air-fuel mixture readings

Installation Notes

Install the sensor in the upstream position specified for the vehicle application. Verify connector style, wire count, and thread diameter before installation to confirm the correct replacement. For 2006-2008 Mazda 6 service, match the OE-style routing and ensure the harness length supports the factory mounting location.

Quality Assurance

Denso tests these sensors to OE standards for fit and performance consistency. The OE Style line focuses on direct replacement parts built to match the original application requirements, helping simplify selection for Mazda 6 air/fuel ratio sensor service.

Related reading

This part fits 3 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelTransmissionPositionNotes
2008Mazda6AutomaticUpstreamCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
2007Mazda6AutomaticUpstreamCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
2006Mazda6AutomaticUpstreamCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
Directly replaces or cross-references 5 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Bosch — 15463Mazda — L395188G1NTK — 25686Walker Products — 250-54039Walker Products — 350-64062