Description

Product Overview

The Denso 5399839-Kit supports the replacement of oxygen sensors in various vehicles. This kit provides an OE-level, all-in-one set of matched components that ensure precision fitment and reliability. Common symptoms that may indicate the need for this kit include poor fuel economy, increased emissions, and check engine light activation due to sensor faults. This kit is referenced by MPN 5399839-Kit and is designed to address these issues with compatible components.

Kit Contents

1 x Denso – (234-4266) Downstream Driver Left Oxygen Sensor – OE Style
2 x Denso – (234-9075) Upstream Air / Fuel Ratio Sensors – OE Style

Cross Reference Numbers

This Denso 5399839-Kit is equivalent to or replaces the following part numbers: 234-4266, 234-9075.

Vehicle Compatibility

Land Rover LR3 4.0 V6 (2005–2006)
Land Rover LR3 4.4 V8 (2005–2006)
Land Rover Range Rover Sport 4.2 V8 (2006)
Land Rover Range Rover Sport 4.4 V8 (2006)

This kit also fits other applications. Please use the vehicle selector tool to verify compatibility before purchase.

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Frequently Asked QuestionsWhat symptoms indicate a failing oxygen sensor?

Common symptoms of a failing oxygen sensor include poor fuel economy, rough idling, and the check engine light being illuminated. These issues can lead to excessive emissions and reduced engine performance.

How does an upstream air/fuel ratio sensor function?

An upstream air/fuel ratio sensor measures the amount of oxygen in the exhaust gases before they enter the catalytic converter. This helps the engine control module adjust the fuel mixture for optimal combustion.

What is the difference between upstream and downstream oxygen sensors?

Upstream sensors are located before the catalytic converter and monitor the air/fuel mixture, while downstream sensors are positioned after the converter to monitor its efficiency and emissions levels.

Can a faulty oxygen sensor cause a check engine light?

Yes, a faulty oxygen sensor can trigger the check engine light, often accompanied by diagnostic trouble codes such as P0131 or P0132, indicating sensor performance issues.

Is it necessary to replace all sensors at once?

While it is not mandatory to replace all sensors simultaneously, replacing them as a set can help maintain balanced performance and prevent future issues related to miscommunication between old and new sensors.

Order Denso 5399839-Kit today to support a complete, well-matched repair for your vehicle.

Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.