I need help to diagnose white smoke issue.
Because of white smoke in the tailpipe and engine bay turbo area, I replaced N14 oil filter housing gasket to engine block and oil cooler gasket.
There are white colored deposits on the exit of the exhaust pipe edge.

After the above replacements, key on engine off and check engine light on, I scanned MINI without cranking engine. It displayed as below.
DID:2740,DME: Ignition coil, cylinder 2, ignition-circuit monitoring
DID:277F,DME: Combustion misfires, cylinder 2
DID:2783,DME: Combustion misfires, several cylinders
DID:2F8F,DME: Engine shutdown time, plausibility

When I started my Mini, it still had white smoke in both around turbocharger position and exhaust tailpipe. I once loaned a coolant system pressure tester and did not find leakage. Does the coolant system pressure tester only test the radiator side, not engine side?

How could I find the reasons for white smoke in turbo area?

My previous thread about the issue<R55 Help to diagnose reasons for white smoke and oil leakage. - North American Motoring>

 

Maybe you should start by fixing the cylinder 2 misfire, which may be caused by a faulty coil.

The pressure tester should be able to reveal a leak anywhere in the cooling system.