Removing High-Pressure Sensor (Rail Pressure Sensor)

WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Toxic substances

Danger of poisoning or suffocation
Danger of burns to the eyes and skin

→ Ventilate the work area well.

→ Never ingest or inhale.

→ Read specific information on the Hazard Sheet.

→ Wear personal protective gear.

→ Do not smoke, eat or drink in the work area.

WARNING: Highly inflammable or explosive materials

Danger of fire or explosion

→ Avoid contact with hot parts or sources of ignition.

→ Use suction to remove ignitable vapours.

→ Attach warning sign in a clearly visible position.

NOTE: Dirt on injection system components

Material damage
Rough-running engine
Bad exhaust emissions

→ Thoroughly clean connection points and adjacent areas before loosening them. If the engine is very dirty, wash it before starting disassembly work.

→ Lay removed parts on a clean surface and cover them. Do not use fibre-shedding cloths.

→ Carefully cover components or seal them if repair work will not be carried out immediately. Place rubber caps on connections. Seal intake openings with film or adhesive tape.

→ Only install clean parts. Do not take spare parts out of the packaging until just before installation.

→ Never use compressed air when the system is open. Do not move the vehicle.

WARNING: Leaking fuel supply lines

Emerging fuel
Risk of fire

→ Perform leak test.

Information

Do not bend high-pressure lines. Always remove the high-pressure distributor pipe and other fuel-supply components in the high-pressure area completely. Check that the connection points are not damaged and are perfectly clean and make sure there is no thread damage. Fit union nuts on all connection points by hand before screwing in screws or bolts. Remove dirt on the conical/ball joints. Check connection points for leaks following fitting.

Information

The ignition must be switched off when working on the fuel system.
Absorb any escaping fuel using a suitable binding material or a cloth.
Cloths which have absorbed fuel must be disposed of according to the applicable national laws.
The fuel system must be depressurised before starting work on it.
Only work on the fuel system in well-ventilated rooms.
Any seals which have been removed must always be replaced.

Remove cable plug for high pressure sensor -3- .

Fig 1: Identifying High-Pressure System Connections
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Place a cloth under the high-pressure sensor and remove the high-pressure sensor slowly using a long socket (e.g. Hazet 900 Lg socket-wrench insert Nr.188 or a similar tool). Relieve the fuel pressure by slowly opening the high-pressure sensor.
Visually check the thread and sealing ball to make sure they are not damaged.