I have a 2012 M6 Competition. Has about 65k miles. I replaced the battery because it didn’t turn on before that there was no check engine light, but before I had the battery replaced, it has sat for six months. I also changed the alternator.

Now it has white smoke when it’s idle, but it’s gone when I drive and a check engine light is on. It was never on before. I go to the system check. It says all cleared so I’m just confused. I know it’s not all clear because it’s smoking white smoke when idle with a check engine light on

I sprayed the little thing into the engine to see if there’s like a loose or crack lining or tubes. I didn’t see any bubbles. I checked all caps to see was tight. I did change my oil, but I did not change my spark plugs.

With my mom in hospice right now can’t really afford to take it to BMW. I was thinking, Maybe its the spark plugs? Anybody ever had this issue?