Audi S4 B7 4.2 V8 Air Intake Mass Flow Meter Sensor Intake Unit 077133471K

Audi S4 B7 4.2 V8 Air Intake Mass Flow Meter Sensor Intake Unit is a precision intake system measurement unit, designed specifically for the V8 petrol engine. As a component from the Air and fuel intake sensors group, it is responsible for the accurate measurement of intake air mass, which allows the engine control unit to properly dose fuel and ensures stable operation of the powertrain. This used OEM component is a sensible choice for servicing a high-performance vehicle when you want to maintain factory operating parameters.

Specifications and technical data

• SKU: 077133471K
• Mark: Audi
• Condition: Used
• OEM Part Number: 077133471K
• Substitutable numbers: 077133471K, 077 133 471 K, 0280218067, 0 280 218 067
• Fuel type: Petrol
• Rim width: 6
• Category: Air Intake & Fuel Sensors

Function and role in the intake system

The mass flow meter in the Audi S4 B7 4.2 V8 operates in the direct stream of air drawn into the intake manifold. Based on the signal from the sensor, the engine control unit determines the fuel dose, adjusts the ignition timing, and stabilizes idle speed. A properly functioning measurement unit translates into:

• smooth acceleration across the entire rev range,
• stable engine operation when cold and warm,
• correct air-fuel mixture in the petrol engine,
• reduction of excessive fuel consumption and incorrect long-term fuel trims.

For a high-power naturally aspirated V8 engine, signal repeatability from the sensor is particularly important, which is why using an original unit from the Air and fuel intake sensors group helps maintain factory performance characteristics.

Compatibility and technical application

The described mass flow meter unit is intended for use with a petrol engine, which is significant for the measurement characteristics and controller calibration. In practice, this means that the sensor is adapted to:

• the air flow range typical for the 4.2 V8 unit,
• operating conditions in the engine bay of a premium class vehicle,
• compatibility with the factory Audi engine control software.

Selecting the component according to the vehicle manufacturer's and sensor manufacturer's markings facilitates diagnostics and subsequent maintenance, and minimizes the risk of adaptation issues after installation.

Characteristics of the used component

The offered mass flow meter is a used component, which in practice means it has been removed from a vehicle and was previously in operation. This type of component is an attractive alternative to new parts, especially for specialized models where compliance with factory specifications is essential. A used sensor allows you to:

• reduce repair costs while maintaining the original design,
• maintain the consistency of the intake system with other OEM components,
• limit the risk of problems typical of cheap replacements with uncertain calibration.

Before installation, a standard diagnostic procedure on the vehicle (reading current parameters, potential adaptation in the controller) is recommended to confirm proper cooperation with the specific engine configuration.

Significance for petrol engine operation

In a petrol-powered engine, precise air mass measurement is crucial for protecting the powertrain and exhaust system components. A functional mass flow meter helps limit phenomena such as an overly rich or lean mixture, which can affect exhaust gas temperature, engine smoothness, and fuel consumption. In the case of the 4.2 V8 unit, this is particularly important due to:

• high power density and thermal load,
• exhaust gas quality requirements,
• cooperation with advanced ignition and injection control.

Replacing a worn or unstable sensor with a functional OEM component is one of the fundamental steps in troubleshooting uneven operation, power loss, or increased fuel consumption in this model.

Service expansion and selection of 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 flow sensors, air temperature measurement elements, or components related to fuel dosing, check the available parts in the Audi air and fuel intake sensors category.

To better plan service work within the engine supply system, it is worth checking the guide on diagnostics and operation of the fuel system – it discusses in detail the selection of components by manufacturer numbers, typical symptoms of wear, and regeneration procedures: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.