12 14 600 Removing/replacing knock sensors

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 BMW 535xi, 2010 BMW 535i, 2009 BMW 535xi, 2009 BMW 535i, and 2008 BMW 535xi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

WARNING: Disconnect BATTERY NEGATIVE TERMINAL (risk of fire due to short-circuiting on removal).
Electric fuel pump starts up automatically each time door is opened!
Carry out installation work on fuel system only with coolant temperature below 40 °C.

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.

IMPORTANT: Aluminium screws/bolts must be replaced each time they are released.
The end faces of aluminium screws/bolts are painted blue for the purposes of reliable identification.
Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Necessary preliminary tasks:

Read out fault memory of DME control unit
Switch off ignition
Remove INTAKE AIR MANIFOLD

NOTE: Illustration shows N54.

Recycling:

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel.

Observe country-specific waste-disposal regulations.

Unlock plug (1) and remove.

Unlock and detach fuel line (2).

Catch and dispose of escaping fuel.

Fig 1: Identifying Plug And Fuel Line

G05501886

Courtesy of BMW OF NORTH AMERICA, INC.

Seal fuel lines with special tools 13 5 281 and 13 5 282 .

Fig 2: Identifying Special Tools 13 5 281 And 13 5 282

G05501887

Courtesy of BMW OF NORTH AMERICA, INC.

Slacken nut (1).

Close off fuel line connection of high-pressure pump with a matching plug from special tool kit 32 1 270 .

Release screw (2).

Installation:

Replace aluminium screw.

Remove feed line (3).

Fig 3: Identifying Nut, Screw And Feed Line

G05501888

Courtesy of BMW OF NORTH AMERICA, INC.

Seal feed line with matching plug from special tool kit 32 1 270 .

Fig 4: Identifying Special Tool Kit 32 1 270

G05501889

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and remove.

Fig 5: Identifying Plug

G05501890

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws on both knock sensors (1) and remove knock sensors (1).

Installation:

Replace aluminium screws.
Tightening torque 12 14 1AZ .

Fig 6: Identifying Knock Sensors With Screws
Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Clean contact surface of knock sensors on engine block.

Fig 7: Locating Contact Surface Cleaning Area

G05501892

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Pre-install feed line (3).

In so doing, tighten screw connection hand-tight only (it must still be possible to move the line at the holder).

Fig 8: Identifying Nut, Screw And Feed Line

G05501893

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Sequence of screw connection must be observed!

Tighten nut (1). Tightening torque 13 53 6AZ .
Tighten screw (2). Replace aluminium screw. Tightening torque 13 53 9AZ .

NOTE: Reassemble the vehicle.
Check stored fault messages.
Now clear the fault memory.