Audi S5 8T 4.2 FSI CAUA Quattro Air Mass Flow Meter 079133471

Visual condition of the part

The product shows signs of use visible in the photos.

The Audi S5 8T 4.2 FSI CAUA Quattro Air Mass Flow Meter is a precision intake system component from the Air and fuel intake sensors group, designed to work with high-power gasoline engines. It is responsible for accurately measuring the mass of intake air, which allows the engine control unit to properly dose fuel and ensure stable engine operation. Thanks to this component, the fuel system maintains proper dynamics, smooth operation, and predictable throttle response.

Specifications and technical data

• SKU: 079133471-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 079133471
• Substitutable numbers: 079133471, 079 133 471, 0280218214, 0 280 218 214
• Fuel type: Petrol
• Category: Air Intake & Fuel Sensors

Function and role in the intake system

The mass air flow meter in the Audi S5 8T 4.2 FSI CAUA Quattro is a key sensor for controlling the air-fuel mixture in a gasoline engine. Based on the signal from this component, the controller calculates the fuel dose, ignition timing, and adaptive corrections, which results in:

• stable idle speed and smooth acceleration,
• consistent performance across the full rev range,
• more predictable fuel consumption,
• reduced risk of running a mixture that is too lean or too rich.

For an FSI-type gasoline engine, a properly functioning air flow meter is particularly important, as direct injection requires precise data on the amount of air at every load range.

Compatibility and part identification

The offered component belongs to the Air and fuel intake sensors group intended for Audi vehicles. It is a solution dedicated to gasoline units, which ensures proper signal scaling and correct cooperation with the factory engine control software. It is always worth confirming the choice of the air flow meter based on the OEM number and interchangeable numbers – this allows you to avoid electrical and mechanical compatibility issues.

Thanks to the manufacturer's markings and compliance with Audi factory standards, the sensor can be used as a direct replacement for a damaged component, without the need to modify the wiring harness or the air filter housing.

Performance characteristics and benefits of use

A functional mass air flow meter in the Audi S5 8T 4.2 FSI CAUA Quattro affects a number of vehicle operating parameters. In practice, its proper operation helps to reduce typical symptoms of wear or damage, such as rough cold running, "hesitation" during acceleration, or increased fuel consumption. Using an original sensor from the same design group allows you to maintain:

• proper cooperation with the factory engine controller,
• stable long-term fuel trim corrections,
• consistent exhaust emission parameters,
• appropriate dynamics under higher loads.

In the case of large-displacement gasoline engines, such as the 4.2 FSI, the precision of air mass measurement has a direct impact on the perceived flexibility and smoothness of the engine. Replacing a worn sensor with a functional component from the same product line is therefore a real way to restore the correct operating parameters of the fuel system.

Condition, origin, and practical application

The offered air flow meter is a secondary market component, which allows for an economical repair of the intake system while maintaining the original design specifications. Such used Air and fuel intake sensors are often chosen in situations where you want to maintain the factory engine operating characteristics without having to invest in a new component. Before installation, a standard diagnostic procedure and adaptation in the controller are recommended, if provided for by the specific vehicle model.

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 boost pressure sensors, air temperature sensors, or additional measuring elements in the fuel system, check the available parts in the Audi air and fuel intake sensors category.

Used sensor selection and technical support

When choosing a used air flow meter for the Audi S5 8T 4.2 FSI CAUA Quattro, it is crucial to verify compatibility by OEM number and reference numbers, as well as matching it to the fuel type. It is also worth checking whether the sensor version used corresponds to the engine controller configuration in a given vehicle model year. Proper selection reduces the risk of ECU memory errors, adaptation problems, and incorrect readings in diagnostics.

To better understand how to safely use secondary market components and how to select them by catalog numbers, it is worth reading the guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. You will find practical tips there regarding compatibility, installation, and the most frequently asked questions related to used sensors.