BMW Check Engine Light, Rough Idle and Oil Leaks Repair on my 2003 Z4 E85 with M54 6 cylinder engine

I bought a 2003 BMW Z4 it arrived with a few issues : Check Engine Light on, a rough idle and a big oil leak from the Oil Filter Housing Gasket. These are all typical problems that I was able to repair myself.
DIY For Life !
Parts and Took links:
Gasket : amzn.to/3VfdR8U
Liqui Moly Oil : amzn.to/4a9EeRS
36mm Oil Filter Socket: amzn.to/3PgRP1W
Gloves: amzn.to/49R8Urs
OBD Code Reader: amzn.to/49T2sA0
Headlamp: amzn.to/3TfVKx8
Drive Belts and Pulley: amzn.to/3wQ74Zb
Air Filter: amzn.to/3v9hEtU
Cabin Filter: amzn.to/4agDLNX
Torx Tool Kit: amzn.to/3wLwfvR
3/8 Extendable Wrench: amzn.to/49Q3BZ3
3/8 Torque Wrench: amzn.to/48TBtD5
Craftsmen Socket set: amzn.to/43hyNOA
Jack: amzn.to/48ScOiw
Jack Stands: amzn.to/3PiMO8M
DISA Valve Rebuild Kit: amzn.to/4c7pWmy
Carhartt Beanie: amzn.to/3Vd5lY7
All Purpose Cleaner/Degreaser: amzn.to/3vebCIr