Denso 234-4118 Oxygen Sensor - Downstream
OE Quality 60-Day Returns
Denso
 OE Style

Denso 234-4118 Oxygen Sensor - Downstream

Brand Denso 234-4118
Position Downstream
Wiring Harness Length 25.24
Sensor Type Heated
Universal Or Specific Fit Specific
Wire Quantity 4
Connector Gender Female
Thread Diameter 0.708
Mounting Type Threaded
Product line OE Style
Fits Mazda · 3 vehicles

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

Heated sensor. Helps support quicker operation and consistent performance.

Threaded mounting. Female connector and 4-wire design for a straightforward install.

Cross-references Mazda LF5G18861, Mazda LF5G18861A and NTK 24447 for the same application. See all 5.

$98.23Free shipping
In stock · usually ships same day before 1pm CST
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Order total $98.23
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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Denso 234-4118 Oxygen Sensor for Mazda 5

Denso 234-4118 is an OE-style heated oxygen sensor built for precise replacement and direct fitment. It is designed for the downstream position on 2008-2010 Mazda 5 models, making it a focused choice for drivers searching for a downstream oxygen sensor for Mazda 5 2008-2010 or a Denso 234-4118 replacement sensor.

Key Features

  • Specific-fit heated oxygen sensor for the downstream location
  • 4-wire design with female connector
  • Threaded mounting type with 0.708 in. thread diameter
  • Wiring harness length: 25.24 in.
  • OE-style replacement engineered for exact fit and function
  • Uses Denso’s aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination

OE-Style Replacement Details

Denso’s OE Style line is built to match original equipment requirements for fit, form, and function. The 234-4118 oxygen sensor is precision built for the Mazda 5 downstream application and is intended to restore accurate exhaust feedback after sensor wear, contamination, or fault codes. This part cross-references Mazda LF5G18861 or NTK 24447 for the same application.

What This Oxygen Sensor Helps Address

  • Check engine light related to downstream oxygen sensor faults
  • Slow or inaccurate exhaust oxygen readings
  • Reduced fuel economy caused by aging sensor response
  • Emissions test failures tied to sensor performance
  • Rougher engine operation from incorrect air-fuel feedback

Installation Notes

Fits 2008-2010 Mazda 5, downstream. Confirm connector style, thread size, and harness length before installation. Because this is a specific-fit threaded sensor, it should be matched to the correct exhaust location and vehicle application before replacement. Use proper oxygen sensor service tools and follow factory torque and wiring routing procedures.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent performance and first-time fit. The sensor design includes contamination protection intended to support long service life and stable engine management performance.

Related reading

This part fits 3 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2010Mazda5DownstreamOE Style
2009Mazda5DownstreamOE Style
2008Mazda5DownstreamOE Style
Directly replaces or cross-references 5 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Mazda — LF5G18861Mazda — LF5G18861ANTK — 24447Walker Products — 250-24769Walker Products — 350-34470