Denso 234-5135 Air / Fuel Ratio Sensor

Denso OE Style Air/Fuel Ratio Sensor

Denso 234-5135 is an OE Style heated air/fuel ratio sensor built for precise replacement on select BMW, Mercedes-Benz, and Mini applications. It is engineered for specific fitment and uses a 5-wire design with a male connector and 14.29 wiring harness length for direct replacement on the listed upstream and downstream positions.

For drivers searching for a Mercedes-Benz ML350 upstream air/fuel ratio sensor or a BMW M3 upstream sensor replacement, this Denso part number 234-5135 is built to match the original configuration and connection style.

Key Features

• OE Style replacement sensor for emission control systems
• Heated sensor design for faster operating temperature
• Specific fit application for the listed vehicles and positions
• 5-wire construction with male connector
• Thread diameter: 0.711
• Wiring harness length: 14.29
• Built and tested to OE-level standards for replacement accuracy

Detailed Product Overview

Denso 234-5135 is an air/fuel ratio sensor used to monitor exhaust oxygen content and help the engine control module maintain the correct fuel mixture. This OE Style sensor is precision-built for exact replacement and first-time fit, making it a direct choice for emissions-related repairs on BMW 323i, 325i, 330i, 525i, 530i, Mercedes-Benz E320, ML350, S550, and other listed applications. The Denso OE Style line focuses on original-equipment fit and connector layout, which helps simplify replacement on vehicles that require a specific sensor configuration.

This part cross-references Bosch 17004 and NTK 24325 for the same application. It is also listed under Denso part number 234-5135 for easy catalog matching.

What It Helps Address

• Check engine light related to air/fuel ratio sensor performance
• Rough idle caused by incorrect fuel mixture feedback
• Reduced fuel economy from inaccurate exhaust sensing
• Emissions test failures tied to sensor response issues
• Driveability concerns from delayed or unstable sensor readings

Installation Notes and Fitment

Fits 2012-2014 Mercedes-Benz ML350, upstream. Fits 2010 Mercedes-Benz ML350, upstream. Fits 2008-2013 BMW M3, upstream. Fits 2013 Mercedes-Benz G63 AMG, upstream. Fits 2010-2013 Mercedes-Benz S400, upstream left. Fits 2008-2011 Mercedes-Benz S450, upstream right. Fits 2007-2011 Mercedes-Benz S550, upstream right. Fits 2009-2010 Mercedes-Benz CL550, upstream right. Fits 2007-2010 Mini Cooper, upstream. Fits 2007-2009 Mercedes-Benz E320, upstream and downstream. Fits 2009 Mercedes-Benz ML320, upstream. Fits 2009 Mercedes-Benz R320, upstream. Fits 2006 BMW 323i, upstream. Fits 2006 BMW 325i, upstream. Fits 2006 BMW 325xi, upstream. Fits 2006 BMW 330i, upstream. Fits 2006 BMW 330xi, upstream. Fits 2006 BMW 525i, upstream. Fits 2006 BMW 525xi, upstream. Fits 2006 BMW 530i, upstream. Fits 2006 BMW 530xi, upstream.

Confirm the sensor position, connector style, and harness routing before installation. This Denso 234-5135 is a specific-fit replacement, so matching the listed year, make, model, and position is important for proper operation.

Quality Assurance

Denso manufactures and tests this OE Style air/fuel ratio sensor to strict original-equipment standards for replacement accuracy and consistent fit. The design is intended to deliver the correct part and fit for the listed applications the first time.