12 12 011 

Switch off ignition.

Remove and install, replace all spark plugs on engine BMW M73

Bank 1-6:

Press catch (2), disconnect plug (1).

Remove and install, replace all spark plugs on engine BMW M73

Open clips (1).
Loosen the hose clamp (2) of the fresh air hose for the air pump.
Disconnect plug connection (3).
Unfasten hose clamp (4).
Remove the upper section of intake filter housing with hot film air mass meter.

Remove and install, replace all spark plugs on engine BMW M73

Bank 7-12:

Open clips (1).
Unfasten hose clamp (2).
Disconnect plug connection (3).
Remove the upper section of intake filter housing with hot film air mass meter.

Remove and install, replace all spark plugs on engine BMW M73

Disconnect plug connections (1 and 2) at the water valve.

Remove and install, replace all spark plugs on engine BMW M73

Pull the water valve (1) out of the rubber mounts (2) and set aside to the bottom.

Remove and install, replace all spark plugs on engine BMW M73

Loosen cable strap (1) and set air hose (2) aside to the bottom.

Remove and install, replace all spark plugs on engine BMW M73

Cylinders 1-8

Use special tool 12 7 131 (extension) and special tool 12 1 171.

Remove and install, replace all spark plugs on engine BMW M73

Cylinders 1-8

Installation note:

Tighten spark plug with special tool 12 1 171 and special tool 12 7 131 (extension), special tool 12 1 200 (torque limiter). Without special tool 12 1 200, note tightening torque. Tightening torque, refer to Technical Data 12 12 1AZ:

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

Remove and install, replace all spark plugs on engine BMW M73

Cylinders 9-12

Use special tool 12 7 132 (extension) and special tool 12 1 171.

Remove and install, replace all spark plugs on engine BMW M73

Cylinders 9-12

Installation note:

Tighten spark plug with special tool 12 1 171 and special tool 12 7 132 (extension), special tool 12 1 200 (torque limiter). Without special tool 12 1 200, note tightening torque. Tightening torque, refer to Technical Data 12 12 1AZ.