Fuel Pressure Sensor/Switch: Service and Repair

13 53 594 Replacing Fuel Low-pressure Sensor (N55)

Special tools required







WARNING:
Disconnect negative battery terminal (risk of fire due to short circuit on dismantling).
Electric fuel pump starts up automatically when door is opened.
Carry out installation work on fuel system only with coolant temperature below 40 degrees Celsius.







Wear safety goggles.







IMPORTANT:
Adhere to conditions of absolute cleanliness during repair work 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 lines or separate components.
- Use only fluff-free cloths.
- Seal all fuel system openings with protective caps or plugs.







Necessary preliminary work:
- Remove throttle body.







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) underneath cable channel (2).
Replace aluminium screws.
Tightening torque 13 53 10AZ.







Unlock connector (1) and remove.
Release fuel low-pressure sensor (2).
Tightening torque 13 53 5AZ.

IMPORTANT: When releasing and tightening down sensor, grip at width across flats of low pressure line (3).

NOTE: Seal low pressure line (3) if necessary with a matching plug from set of special tools 32 1 270.







Assemble engine.
Check fuel system for tightness.
Check function of DME.