Sylvie Willis
The low-pressure fuel sensor in the Audi A4 B7 is a common topic of discussion among car enthusiasts and Audi owners. The sensor is located on the high-pressure fuel pump or the centre of the main fuel rail, and it plays a crucial role in monitoring fuel pressure. However, some owners have reported issues with long crank starting and rough idling, which may be related to the low-pressure fuel sensor. It is important to note that modifying or tampering with the low-pressure fuel sensor or any other emission control device on your vehicle may be illegal in some jurisdictions, and it is always recommended to consult a certified mechanic or Audi specialist for any repairs or modifications.
| Characteristics | Values |
|---|---|
| Brand | Hamburg-Technic |
| Model | Audi A4 B7 |
| Part Number | 06E906051K |
| Vehicle Type | 2012-2011 Audi Q5 Elite Sport Utility 4-Door 3.2L 3197CC 195Cu. In. V6 GAS DOHC Naturally Aspirated |
| 2012-2011 Audi TT Base Convertible 2-Door 2.0L 1984CC 121Cu. In. l4 GAS DOHC Turbocharged | |
| 2012-2011 Audi TT Base Coupe 2-Door 2.0L 1984CC 121Cu. In. l4 GAS DOHC Turbocharged | |
| 2011 Audi Q5 Base Sport Utility 4-Door 3.2L 3197CC 195Cu. In. V6 GAS DOHC Naturally Aspirated | |
| 2011 Audi Q5 Luxury Sport Utility 4-Door 3.2L 3197CC 195Cu. In. V6 GAS DOHC Naturally Aspirated | |
| 2008-2006 Audi A3 Quattro Base Hatchback 4-Door 2.0L 1984CC 121Cu. In. l4 GAS DOHC Naturally Aspirated | |
| 2008-2006 Audi A3 Quattro Base Hatchback 4-Door 2.0L 1984CC 121Cu. In. l4 GAS DOHC Turbocharged |
What You'll Learn
The sensor has an indented, beveled port that plugs into the fuel pump
The low-pressure fuel sensor for the B7 A4 has an indented, beveled port that plugs into the fuel pump or fuel rail. The fuel rail is the metal pipe that delivers fuel to the injectors. The fuel pump is part of the fuel delivery system, which works with the fuel rail to deliver enough gasoline to the engine upon demand.
The fuel pressure sensor is an electronic device that monitors the pressure inside the fuel rail. It consists of a semiconductor and an electric circuit. The fuel pressure causes alterations in the semiconductor's resistance, which the sensor's integrated circuit converts into a digital signal for the PCM. The PCM then uses this information to control the fuel supply to the engine.
The OEM part number for the low-pressure fuel sensor for the B7 A4 is 06E906051K or 06E 906 051 K. This sensor fits most Audi-VW FSI motors, including the B7-A4 2.0T, the Audi A3/VW GTI 2.0T, the Audi 3.2L FSI V6 (B7-A4 and C6-A6), and the Audi 4.2L FSI V8 found in the B7-RS4.
A faulty fuel rail pressure sensor can cause various issues, including an illuminated check engine light, engine start problems, poor engine performance, bad fuel economy, and engine misfires. If you experience any of these issues, it is recommended to replace the fuel rail pressure sensor as soon as possible to avoid further engine problems.
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The sensor fits most Audi-VW FSI motors
The low-pressure fuel sensor is a component of the fuel system in Audi and Volkswagen (VW) vehicles. This sensor is designed to monitor the pressure of the fuel in the fuel lines, ensuring that the engine receives the appropriate amount of fuel for optimal performance. While the specific maintenance schedule for this sensor may vary depending on the vehicle's make, model, and year, it is generally recommended to have it inspected and replaced if necessary during regular service intervals.
The low-pressure fuel sensor fits most Audi-VW FSI motors, including:
- B7-A4 2.0T
- Audi A3/VW GTI 2.0T
- Audi 3.2L FSI V6 (B7-A4 and C6-A6)
- Audi 4.2L FSI V8 found in the B8-S5, A8, and B7-RS4
- 3.0T FSI Supercharged V6 motor found in the B8 S4, B8-S5, C7-A6, and the Q5
It's important to refer to the specific vehicle's maintenance schedule and consult a qualified mechanic or Audi-VW specialist for accurate information regarding the low-pressure fuel sensor maintenance intervals and replacement procedures.
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The sensor has a protruding cone end that screws into the fuel rail
The Bosch High Fuel Pressure Sensor, also known as the "Thrust Sensor", is a component of the B7-A4 2.0T FSI engine. This sensor has a protruding cone-shaped end that screws into the fuel rail, where it plays a vital role in monitoring fuel pressure.
The protruding cone end of the sensor is designed to securely attach to the fuel rail, ensuring a tight and leak-proof connection. This connection allows the sensor to accurately measure the fuel pressure within the rail and transmit this data to the engine control unit. The engine control unit then analyses this information and adjusts the timing and quantity of fuel injections accordingly, optimising engine performance and fuel efficiency.
Over time, the protruding cone end of the sensor may experience wear and tear, or become clogged with impurities in the fuel. This can affect its performance and, in some cases, lead to sensor failure. Therefore, it is important to use high-quality fuel and to replace the sensor when necessary to maintain the optimal functioning of the engine.
The process of replacing the sensor involves unscrewing the protruding cone end from the fuel rail and screwing in a new sensor. This task is typically performed by a mechanic or someone with automotive repair experience, as it requires a good understanding of engine components and fuel systems.
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The sensor is located on the high-pressure fuel pump of your FSI motor
The low-pressure fuel sensor is located on the high-pressure fuel pump of your FSI motor. This sensor has an indented, beveled port that plugs into the fuel pump or fuel rail. The OEM part number for this sensor is 06E906051K or 06E 906 051 K.
The high-pressure fuel pump (HPFP) is located on the driver's side front of the engine at the top. The HPFP is prone to failure, which may cause running issues and a check engine light. It is important to check your cam lobe for wear to ensure it is in good condition. Faults associated with the failure of this part include:
- P0087 Fuel Rail/System Pressure - Too Low
- P1093 Fuel Trim 2, Bank 1 Malfunction
- P2293 Fuel Pressure Regulator 2 Performance
It is recommended to replace the cam follower when installing a new fuel pump. The cam follower can be purchased with the part number 06D-109-309-C.
The HPFP has had some issues on the FSI, often related to damage after the cam follower wears through. When this happens, the tip of the high-pressure fuel pump will ride directly on the lobe of the intake camshaft, damaging both the pump and the camshaft. As the FSI ages, there is also a failure of the N276, an electronically controlled regulating valve in the fuel pump. The N276 cannot be serviced and must be replaced along with the entire high-pressure pump.
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The sensor is sometimes called the thrust sensor
The low-pressure fuel sensor is sometimes referred to as the thrust sensor. This sensor is located on the high-pressure fuel pump of your FSI motor or on the centre of the main fuel rail. The thrust sensor has a protruding cone end that screws into the fuel rail.
On the B7-A4 2.0T FSI, the thrust sensor is made by Bosch, an original equipment supplier for many Audi and Volkswagen fuel pressure sensors. The sensor installs in a fuel line underneath the intake manifold, near the rail valve, towards the front of the car.
The OEM part number for the thrust sensor is 06E906051K or 06E 906 051 K. This sensor fits most Audi-VW FSI motors, including the B7-A4 2.0T, the Audi A3/VW GTI 2.0T, the Audi 3.2L FSI V6 (B7-A4 and C6-A6), and the Audi 4.2L FSI V8 found in the B7-RS4.
It's important to note that there was a VIN split for this sensor between the 2006 and 2007 model years of the B7-A4 2.0T. The part number for the early sensor is 06J906051C, while the part number for the late sensor is 06J906051D.
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Frequently asked questions
The OEM part number for the low-pressure fuel sensor for the B7 A4 is 06E906051K.
The low-pressure fuel sensor is located on the high-pressure fuel pump of the FSI motor or in the center of the main fuel rail.
It may be normal for the gauge on the low fuel pressure side to be unsteady when the engine is running as the fuel is returning from the fuel rail by the fuel pressure regulating valve and goes back into the low fuel line.
