BMW E60 E81 Z4 E89 E90 E91 LCI Petrol N52N N53 Air Mass Flow Sensor 7551638

The BMW E60 E81 E90 LCI Air Mass Meter 7551638 is an original intake system component from the Air and Fuel Intake Sensors group, designed for BMW gasoline engines. Precise measurement of the ingested air mass ensures stable engine operation, correct fuel dosing, and predictable throttle response.

Specifications and technical data

• SKU: 7551638-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7551638
• Substitutable numbers: 13627551638, 7551638, 5WK97508, ŁS, 13627585680, 7585680
• Fuel type: Petrol
• Category: Air Intake & Fuel Sensors

Function of the Air Mass Meter in a BMW Gasoline Engine

In BMW gasoline engine models, the air mass meter is responsible for continuously measuring the amount of air drawn into the intake manifold. Based on this data, the engine control unit determines the fuel dose, ignition timing, and engine operating strategy. A functional sensor translates to:

• stable idle speed without fluctuations,
• smooth acceleration across the entire RPM range,
• limited excessive fuel consumption,
• reduced risk of engine error lights illuminating.

Compatibility and Selection by BMW Numbers

The offered air mass meter comes from the BMW parts family and is assigned a specific OEM reference number and related interchangeable numbers. This allows for a technically correct replacement within the same product line, without the need for modifications to the electrical system or intake system. Selection by part number or vehicle VIN allows verification of compatibility with a specific gasoline engine version and avoids hardware and software compatibility issues.

Characteristics of a Used Component

The air mass meter is a used component, sourced from disassembly, which allows for economical repair of the intake system while maintaining original BMW specifications. These types of sensors, when operated correctly, retain their operating parameters for a long time, and using parts from the same reference family reduces the risk of incorrect readings compared to low-quality aftermarket alternatives.

Benefits of Using an Original BMW Air Mass Meter

Using an original air mass meter in a BMW gasoline engine allows for the maintenance of the engine's factory operating characteristics. Key benefits include:

• maintaining fuel consumption parameters consistent with the engine control unit maps,
• better repeatability of air mass measurement compared to random aftermarket parts,
• reduced risk of errors related to the fuel-air mixture,
• consistency with other components of the intake and engine control system.

Selection of Other BMW Air and Fuel Intake Sensors

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

Support in Selecting Used Electronics and Sensors

When selecting a used air mass meter, correct matching by OEM number, interchangeable numbers, and hardware compatibility with the specific engine control unit version is crucial. A detailed discussion of selection principles, compatibility verification, and practical installation examples can be found in the Global Parts guide: Used Automotive Electronics Onboard – Why Choose Second-Hand ECUs and Sensors?