If your code reader is sophisticated enough it might allow you to pull pending codes that get registered much quicker. Only once the code is confirmed it trigger the CEL

As others mentioned the crankcase ventilation system is another known source of vacuum leaks. I went through your exact same process...

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ZetaTre
2003 BMW Z4 2.5i
2004 BMW X3 3.0i
2006 Ducati 999S
1999 Ducati Monster 750