Mercedes W164 Mass Meter Diesel OM629 Air Intake Flow MAF Sensor A6290980440

The Mercedes W164 Air Flow Meter Diesel OM629 MAF is a component from the Air and Fuel Intake Sensors group, designed for precise measurement of the amount of air drawn into the diesel engine. A properly selected air flow meter supports stable engine operation, correct fuel dosing, and smooth operation of the injection system. This is a solution for users who expect a proven component with parameters matching factory specifications.

Specifications and technical data

• SKU: A6290980440
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6290980440
• Substitutable numbers: A6290980440, A 629 098 04 40
• Fuel type: Diesel
• Category: Air Intake & Fuel Sensors

Purpose and Function in the Intake System

The described air flow meter is designed for the OM629 family of diesel engines used in Mercedes W164 models. Its task is to accurately measure the mass of air drawn in by the engine, allowing the control unit to correctly determine the fuel dose and maintain optimal combustion parameters. A properly functioning MAF reduces smoke, supports smooth idling, and helps maintain stable power across the entire RPM range.

In diesel engines, the role of the air flow meter is particularly important, as the dynamics, exhaust emissions, and operational safety of auxiliary components such as the turbocharger or particulate filter depend on the quality of the signal from the sensor.

Benefits of Using a Dedicated Air Flow Meter

Using an air flow meter tailored to the OM629 unit in the Mercedes W164 provides a range of practical operational benefits:

• maintaining stable air-fuel mixture parameters under typical driving conditions,
• more predictable throttle response,
• reducing the risk of the engine entering limp mode due to incorrect air mass readings,
• better cooperation with the boost system and exhaust gas treatment systems.

This ensures the driver receives a vehicle that behaves according to factory specifications, and diagnostics of potential intake system faults are simpler and more predictable.

Technical Characteristics and Compatibility

The air flow meter belongs to the Air and Fuel Intake Sensors group, meaning it works directly with the intake system and the engine control unit. The design is adapted to the specifics of the diesel unit, where both high airflow under load and measurement stability at low RPMs are important. The component has been developed for the Mercedes brand, which facilitates proper matching with the factory wiring harness and intake duct geometry.

It is always advisable to confirm the selection of the air flow meter based on vehicle data such as the VIN and engine parameters. This helps avoid compatibility issues and ensures correct cooperation with the control unit's software.

Product Condition and Practical Application

The offered air flow meter is a used component, making it an attractive solution for users seeking a cost-effective component with parameters close to factory specifications. This type of part is suitable for both standard replacement of a worn sensor and for intake system repairs after a failure, when restoring correct air mass readings is necessary.

In practice, installing the air flow meter in a Mercedes W164 with an OM629 diesel engine allows for the restoration of correct cooperation between the control unit and the injection system, which can translate into more stable engine operation, reduced ECU error codes, and more predictable vehicle behavior in daily use.

Support in Selection and Intake System Expansion

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional sensors, intake duct elements, or components cooperating with the fuel system, check the available parts in the Mercedes Air and Fuel Intake Sensors category.

When selecting a used air flow meter or other electronic components, pay attention to the compatibility of markings, hardware and software versions, and the mounting method. A detailed discussion of these issues, along with practical examples and tips for selection by VIN and part numbers, can be found in the article Used Automotive Electronics Onboard – Why Choose Second-Hand ECUs and Sensors?.