The cylinder head cover is sealed with a rubber gasket.
The fuel injector mounting bolts are also sealed with rubber rings.
If tightening the bolts does not eliminate the oil leak, then the gasket or rings must be replaced.
To replace the gasket, you will need the following tools: pliers, a 10 mm socket, a plastic mounting spatula, and a flat-blade screwdriver.
Prepare the car for the job. Disconnect the negative battery terminal.
Removing the EGR bypass pipe
Removing the injectors
Pry off the wire harness holder with a plastic mounting blade
Disconnect one holder from the cover
Then disconnect the second holder
Then disconnect the third holder of the injector wiring harness
Move the wiring harness to the side
Loosen the clamp securing the crankcase ventilation hose by squeezing its bent ears, slide the clamp along the hose
Remove the hose from the ventilation system breather nipple
Unscrew the ten bolts securing the cover to the cylinder head
Remove the cover and remove the sealing gasket from the cover grooves
The head mounting bolts are held in place by rubber bushings. There is no need to remove them.
If there was an oil leak from under the fuel injector, use a screwdriver to pry up the edge of its sealing ring and remove the ring from the cylinder head cover hole.
Remove the remaining injector rings in the same way.
If necessary, pry with a screwdriver
Remove the injector mounting bolt sealing rings from the cover holes
Clean the cover grooves from the remains of the old gasket and install the new gasket in the cover grooves.
Lubricate the injector and bolt sealing rings with engine oil to facilitate installation.
Install the cylinder head cover and all parts in reverse order.
Tighten the cover mounting bolts to 10 Nm in the order shown in the figure.