Spark Plug: Service and Repair

Replacing All Spark Plugs

Special tools required:
- 12 1 171
- 12 1 200

NOTE:
This repair instruction is valid for the following engines:
- M52 / M52TU / M54 / M56
- S52 / S50US

Necessary preliminary tasks:
- Remove ignition coils. Service and Repair







Unscrew and remove spark plugs with special tool 12 1 171 in conjunction with special tool 12 1 200.

Installation:
If special tool 12 1 200 is not used,

Tightening Torque
1AZ Spark plugs (ungreased)
M12x1.25 23 ±3 Nm
M14x1.25 30 ±3 Nm