Ignition Coil: Service and Repair

12 13 511 Removing/Replacing Spark Plugs(S63)







Necessary preliminary tasks:
- Read out the fault memory of the DME control unit.
- Check stored fault messages and process procedure.
- Switch off ignition
- Remove intake silencer housing







IMPORTANT:
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.







Version 1:
Release screws (1).
Tightening torque 17 10 7AZ.
Lay expansion tank with retaining plate to the side.







Version 2:
Release screws (1).
Tightening torque 17 10 4AZ.
Do not remove coolant hoses (2).
Disconnect expansion tank for charge air cooler (3) from holder.







Release screw (1).
Tightening torque 13 71 10AZ.
Place holder (2) with A/C lines aside.
Feed out expansion tank for charge air cooler and lay to the side.







Slacken nut (1).
Tightening torque 13 71 9AZ.
Remove vacuum reservoir (2) left of holder and place aside.







Slacken nut (1).
Tightening torque 13 71 9AZ.
Remove vacuum reservoir (2) right of holder and place aside.







This procedure is applicable to all ignition coils.
Unlock plug catch (1) of ignition coil (2) and disconnect plug.
Pull ignition coil (2) up and out.







Installation note:
Check that rubber seal of ignition coil (1) is correctly seated.







Installation note:
Push connector (1) with connector catch (2) open onto ignition coil.
Carefully close connector catch (2) in direction of arrow.
The connector catch must snap into place without great effort.







NOTE:
Delete fault memory.
Assemble engine.