Denso 234-5042 Air / Fuel Ratio Sensor - Upstream
OE Quality 60-Day Returns
Denso
 OE Style

Denso 234-5042 Air / Fuel Ratio Sensor - Upstream

Brand Denso 234-5042
Position Upstream
Connector Gender Male Female
Grade Type Regular
Sensor Type Heated
Thread Diameter 0.711
Universal Or Specific Fit Specific
Wire Quantity 5
Wiring Harness Length 29.53
Product line OE Style
Fits Mazda · 4 vehicles

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

Heated sensor design. Helps deliver accurate air-fuel ratio readings.

Manufactured and tested to strict OE standards.

Cross-references Bosch 18056, Mazda L3CE188G1 and NTK 24393 for the same application. See all 5.

$304.63Free shipping
In stock · usually ships same day before 1pm CST
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Order total $304.63
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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

Denso 234-5042 is an OE Style heated air/fuel ratio sensor built for direct replacement on specific applications. It is engineered for the 2010-2013 Mazda 3 upstream position, with a 5-wire design and a specific fit for accurate installation and signal response.

For Mazda 3 owners searching for an upstream air fuel ratio sensor, Denso 234-5042 provides the correct fitment and OE-style construction for the listed vehicle application.

Key Features

  • Heated air/fuel ratio sensor for upstream placement
  • Specific fit for 2010-2013 Mazda 3
  • 5-wire configuration with male/female connector design
  • OE Style line focused on exact replacement fit
  • Precision-built to match factory dimensions and connection points
  • Wiring harness length: 29.53
  • Thread diameter: 0.711

Detailed Description

Denso 234-5042 is part of the OE Style product line, which focuses on direct-fit replacement sensors built to match original equipment requirements. Denso manufactures and tests these air/fuel ratio sensors to OE standards, with attention to exact fit and consistent performance characteristics. This makes it a practical choice for a Mazda 3 upstream sensor replacement when the original sensor has aged, failed, or triggered drivability concerns.

This part cross-references Bosch 18056 for the same application. It is also listed against NTK 24393 for the same application.

What This Sensor Helps Address

  • Check engine light related to upstream air/fuel ratio sensor faults
  • Incorrect fuel mixture readings from a worn sensor
  • Rough idle caused by inaccurate exhaust feedback
  • Poor fuel control from a failing heated sensor
  • Emissions test issues tied to sensor response problems

Installation Notes and Tips

Fits 2010-2013 Mazda 3, upstream. Confirm the connector style, wire count, and thread diameter before installation to match the original sensor location. Because this is a specific-fit replacement, it is intended for the listed Mazda 3 application rather than universal use.

Quality Assurance

Denso builds this sensor to strict OE standards and tests it for replacement accuracy and first-time fit. The OE Style line is intended to deliver the correct part for the listed application with factory-style dimensional and electrical compatibility.

Related reading

This part fits 4 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2013Mazda3UpstreamOE Style
2012Mazda3UpstreamOE Style
2011Mazda3UpstreamOE Style
2010Mazda3UpstreamOE Style
Directly replaces or cross-references 5 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Bosch — 18056Mazda — L3CE188G1NTK — 24393Walker Products — 250-25067Walker Products — 350-35045