12 13 511 Replacing ignition coils (N52, N52K, N51)

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2013 BMW 328xi, 2013 BMW 328i, 2012 BMW 328xi, 2012 BMW 328i, and 2011 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Read out fault memory of DME control unit.
Check stored fault messages
Switch off ignition
Remove Ignition Coil Cover

Ignition coils must not be contaminated by fuel.

The resistance of the silicone material is reduced significantly by contact with fuel, which may cause the ignition coil to fail!

The silicone tube of the spark plug connector is coated with talc to reduce the pulling forces. The silicone tube must NOT be oiled or greased. This would greatly reduce the durability of the silicone material, which can lead to a malfunction of the ignition coil.

Unlock plug retainer of ignition coil (1) and disconnect plug.

Slowly pull the ignition coil (1) up and out without jerking it.

NOTE:

There is a possibility that the silicone tube will tear and therefore be destroyed.

This procedure is applicable to all ignition coils.

Fig 1: Identifying Ignition Coil And Removal Direction

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Position the ignition coil (1) and gently push it to the limit position, if necessary by twisting it back and forth slightly. Then check anti-twist lock.

The rubber cap must completely surround the sealing collar of the cylinder head cover.

NOTE: If rubber parts are squashed, the ignition coil can slip out again during engine operation.

Fig 2: Identifying Ignition Coil And Installation Direction

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Push plug (1) with plug retainer (2) open onto ignition coil.

Carefully close plug retainer (2) in direction of arrow.

The connector must be positioned on the counter piece with hardly any gaps when the locking lever is being closed. In the process, the cheeks of the lever are positioned inside the counter piece.

NOTE: The locking lever can become deformed if it is not installed correctly. This means that there is no longer a safety lock on the plug connection. As a result, the connector can slip out during engine operation (loose contact, misfiring).

Fig 3: Identifying Plug, Plug Retainer And Installation Directions

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

The plug retainer must snap into place without great effort.

Fig 4: Identifying Plug Retainer

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Now clear the fault memory.