Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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 FILTER HOUSING .
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.
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.
Unlock plug catch (1) on ignition coil (2) and unplug connector.
Pull out the ignition coil (2) slowly in a smooth upwards movement.
This procedure is applicable to all ignition coils.
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.
NO RELATED
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.