Audi R8 42 Centre Fuel Rail Pipe Pressure Sensor 4.2 FSI 079127507AC

Audi R8 42 Centre Fuel Rail Pipe Pressure Sensor 4.2 FSI is an original fuel system component designed for precise monitoring of fuel pressure in the 4.2 FSI engine. Thanks to its factory origin from the Audi brand, it maintains full compatibility with the engine's operating parameters, which translates into stable engine performance and predictable load responses. This is a solution for users who expect a reliable, proven part instead of random replacements.

Specifications and technical data

• SKU: 079127507AC
• Mark: Audi
• Condition: Used
• OEM Part Number: 079127507AC
• Substitutable numbers: 079127507AC, 079 127 507 AC
• Part type: Pipe
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The centre fuel pressure sensor in the 4.2 FSI engine is responsible for real-time measurement of pressure in the fuel rail and transmitting this data to the engine control unit. A properly functioning component of this type:

• enables precise fuel metering across the entire RPM range,
• supports stable engine operation during cold and warm starts,
• reduces the risk of power drops resulting from incorrect pressure readings,
• helps maintain proper combustion parameters, which promotes engine smoothness. In the case of FSI units, the use of an appropriate sensor is particularly important because the direct injection system operates at high pressures and requires precise parameter monitoring.

Benefits of using an original Audi component

Choosing an original fuel pressure sensor for the Audi R8 4.2 FSI ensures a perfect match with the factory characteristics of the engine control unit. As a result:

• compatibility with ECU software and injection control logic is maintained,
• the risk of diagnostic errors related to incorrect signals is reduced,
• consistency of operating parameters with other fuel system components is preserved,
• diagnostics are easier to perform because reading values correspond to factory specifications. For owners of sports cars like the R8, using an original fuel system component is significant not only for reliability but also for consistent performance during dynamic driving.

Component characteristics and installation

The sensor is assigned to the Lines, hoses and pipes group, which reflects its connection to the fuel system and components responsible for fuel transport. As a component mounted in the central part of the system, it works with fuel lines and the injection rail, creating a cohesive system for fuel measurement and distribution. During replacement, it is essential to maintain the correct mounting position and connection tightness to avoid interference with pressure readings. Using an original part facilitates the mechanic's work, as the geometry and mounting method are consistent with the factory design, which limits the need for additional modifications.

Component condition and service application

The offered sensor is in used condition, making it an attractive solution for users looking for a compromise between repair costs and maintaining the vehicle's original specifications. This type of component works well in:

• routine repairs, when the existing sensor generates errors or unstable readings,
• preventive maintenance for starting problems or RPM fluctuations,
• restoring full fuel system efficiency after other service interventions. For workshops specializing in the Audi brand, using an original, used component allows for maintaining high-quality repairs at reasonable material costs.

System expansion and selection of related components

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 fuel lines, flexible hoses, or rigid supply pipes, check the available parts in the Audi lines, hoses and pipes category. To better understand why original, used components for premium cars are gaining importance in the context of costs and availability, it is worth reading the article Crisis in the new parts market? Why used originals for premium cars are the hottest trend in 2026, which discusses current trends in the selection of service parts.