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13 53 596 Replacing high-pressure fuel sensor (N55)

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Special tools required: 

WARNING: Observe warning on cylinder head cover.
Disconnect BATTERY NEGATIVE TERMINAL (risk of fire due to short-circuiting on removal).
Electric fuel pump starts up automatically when door is opened!
Carry out installation work on fuel system only with coolant temperature below 40 °C.
IMPORTANT: Wear full face guard and protective gloves.
Fuel can emerge spontaneously at high velocity when the high-pressure line is released!
IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .
IMPORTANT: Adhere to conditions of absolute cleanliness when working on the high-pressure fuel system.
Introduced contaminants can cause malfunctions in the system!
  • Do not allow any dirt particles or foreign bodies to get into the system.
  • Remove all traces of dirt before removing pipes or individual components.
  • Use only fluff-free cloths.
  • Seal all fuel system openings with protective caps or plugs.

Necessary preliminary work: 

Recycling: 

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel in a suitable container.

Observe country-specific waste disposal regulations.

Release screws (1).

Put cable channel aside.

Fig 1: Identifying Cable Channel And Screws
G09875350Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and remove.

Release high-pressure sensor (2) and remove.

Tightening torque 13 53 4AZ with special tool. 32 2 100

Seal rail (3) 32 1 270 if necessary with a matching plug from special tool kit.

Fig 2: Identifying High Pressure Sensor, Rail And Connector
G09846795Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check fuel system for leaks.

Check function of DME.