Fuel Pressure Sensor/Switch: Service and Repair

13 53 596 - Replacing high-pressure fuel sensor (N54)





Special tools required:
- 32 1 270
- 32 2 100





Warning!
Observe warning on cylinder head cover.

Clamp off battery negative terminal 61 20 900 Disconnecting and Connecting Battery Negative Lead (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!
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 tasks:
- Remove acoustic cover 11 00 ... Removing and Installing/Replacing Acoustic Cover.





Recycling:
Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel in a suitable container.

Observe country-specific waste-disposal regulations.





Unlock plug (1) and remove.

Release high-pressure sensor (2) and remove.

Tightening torque 13 53 3AZ 13 53 Fuel Injection Nozzles and Pipes with special tool 32 2 100.

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

Important!
If reusing:

The high-pressure sensor may only be screwed back in 3 times!

Therefore mark the sensor with a blue dot each time it is screwed back in.





Assemble engine.

Check fuel system for leaks.

Check function of DME.