Audi RS4 B7 Intake Manifold Air Mass Sensor 4.2 FSI 077133471M

Audi RS4 B7 Intake Manifold Air Mass Sensor 4.2 FSI is a component from the Air and fuel intake sensors group, designed for precise measurement of the air intake volume in the 4.2 FSI engine. A properly selected mass air flow sensor supports stable engine operation, correct fuel dosage, and predictable throttle response, which is important for both daily driving and dynamic performance.

Specifications and technical data

• SKU: 077133471M
• Mark: Audi
• Condition: Used
• OEM Part Number: 077133471M
• Substitutable numbers: 077133471M, 077 133 471 M, 0280218187, 0 280 218 187
• Part type: Sensor
• Category: Air Intake & Fuel Sensors

Purpose and function in the intake system

The mass air flow sensor in the Audi RS4 B7 with a 4.2 FSI engine is responsible for continuous measurement of the air mass drawn into the engine and transmitting this data to the engine control unit (ECU). Based on this, the ECU determines the fuel dosage, adjusts ignition timing, and manages other components, which translates into engine refinement, performance, and fuel consumption.

For high-power engines such as the 4.2 FSI, a properly functioning air flow sensor is particularly crucial for maintaining stable idle speed, correct operation at idle, and predictable acceleration across the entire rev range.

Benefits of using an original Audi sensor

The original mass air flow sensor dedicated to the RS4 B7 ensures:

• Proper fitment to the intake system – the geometry and diameter of the housing are consistent with the factory installation, which facilitates assembly and eliminates the need for modifications.
• Consistent cooperation with the factory engine control unit – the measurement characteristics are compatible with the ECU maps intended for the 4.2 FSI unit.
• Stable operating parameters across a wide range of loads – from cold engine operation to high RPMs during dynamic driving.

As a result, replacing a worn or damaged sensor with a component from the same design group helps restore predictable engine behavior and reduce jerking or unstable idle speeds caused by incorrect air measurement.

Product characteristics and condition

The offered mass air flow sensor belongs to the Air and fuel intake sensors category, meaning it is a component that works directly with the vehicle's intake and fuel system. The product is in used condition, which in practice means it has been removed from a vehicle and verified for further serviceability. This type of solution is often chosen for servicing sports cars, where compliance with factory specifications and reasonable repair costs are prioritized.

For users planning conscious vehicle maintenance, expert materials regarding the fuel supply system may be helpful – more information on diagnostics and component selection can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which discusses, among other things, the operating principles of components that work with air sensors.

Selection, compatibility, and technical aspects

When selecting a mass air flow sensor for the Audi RS4 B7 4.2 FSI, it is crucial to use OEM data and interchangeable part numbers to ensure full compatibility with the factory intake system and engine control unit. This model of the sensor was developed specifically for the requirements of the 4.2 FSI unit, which minimizes the risk of adaptation errors, fault codes, and performance drops resulting from incorrect air measurement.

In practice, a correctly selected sensor helps to:

• maintain the proper air-fuel mixture ratio across the full rev range,
• limit excessive fuel consumption caused by incorrect measurement,
• reduce the risk of the engine entering limp mode under high load.

If you are considering a broader renovation of your car and want to approach the purchase of second-hand parts consciously, it is worth reading the guide Renovation and repair of German cars: which used parts are worth buying and which are better to avoid?, which discusses, among other things, the selection of used components for Audi vehicles.

Intake system expansion and related parts

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as additional air temperature sensors, boost pressure measurement elements, or other components responsible for controlling air and fuel flow, check the available parts in the Audi air and fuel intake sensors category.

This approach allows you to organize key components responsible for air and fuel measurement and dosing in a single service stage, which is particularly important in powerful gasoline engines, where the precision of the intake system directly affects engine performance and durability.