Continental 5WK9639Z Mass Air Flow Sensor

Continental MAF Sensor for BMW Emission Control

The Continental 5WK9639Z mass air flow sensor is a genuine OEM-style replacement built to original equipment specifications. It measures incoming air for accurate fuel delivery, helping BMW engines maintain smooth operation, fuel economy, and consistent performance.

• Genuine Continental OEM mass air flow sensor
• 12V electrical specification with 1 connector
• 3 blade terminals, male terminal gender
• Black plastic housing
• Wiring harness not included
• Direct-fit design for emission control applications

Detailed Product Overview

Continental part number 5WK9639Z is a mass air flow sensor engineered for precise airflow measurement in BMW emission control systems. Built to match original fit, form, and function, it supports accurate engine management by helping the ECU calculate the correct air-fuel ratio. This part number 5WK9639Z is a direct OE-style solution for BMW M5, BMW M6, and select 3 Series, 5 Series, X3, and X5 applications.

This part cross-references 74-50059 and 11721438814 for the same application.

Compatible BMW Applications

• Fits 2006-2010 BMW M5, N/A, with Emission Control
• Fits 2006-2010 BMW M6, N/A, with Emission Control
• Fits 2004-2006 BMW 325Ci, N/A, with Emission Control
• Fits 2004-2006 BMW 330Ci, N/A, with Emission Control
• Fits 2004-2006 BMW X3, N/A, with Emission Control
• Fits 2004-2006 BMW X5, N/A, with Emission Control
• Fits 2004-2005 BMW 325i, N/A, with Emission Control
• Fits 2004-2005 BMW 330i, N/A, with Emission Control
• Fits 2004-2005 BMW 525i, N/A, with Emission Control
• Fits 2004-2005 BMW 530i, N/A, with Emission Control
• Fits 2003 BMW 325Ci, N/A, with Emission Control; From 3/03
• Fits 2003 BMW 325i, N/A, with Emission Control; From 3/03
• Fits 2003 BMW 330Ci, N/A, with Emission Control; From 3/03
• Fits 2003 BMW 330i, N/A, with Emission Control; From 3/03

What This Sensor Helps Address

• Incorrect air-fuel mixture readings
• Rough idle or unstable engine operation
• Reduced fuel economy from inaccurate airflow data
• Check engine light conditions related to airflow measurement
• Loss of throttle response caused by a failing MAF sensor

Installation Notes and Tips

Verify connector style, terminal count, and housing shape before installation. This Continental MAF sensor uses a single connector, 3 male blade terminals, and a black plastic housing, and it does not include a wiring harness. Confirm the vehicle’s emission control configuration and model year before ordering, especially for 2003 BMW applications noted as from 3/03.

Quality Assurance

Continental manufactures this sensor to original equipment specifications for fit, form, and function. As an OE supplier, Continental builds the 5WK9639Z to deliver the same type of airflow measurement expected in factory BMW emission control systems.