[bayerischer]

hello,
so i still have lack of power and noticed my vacuum pump is dusty and covered in some oil and dirt but it is supposed to be clean.

anyone can tell when vacuum pump gone bad? is there a code? or some signs to look for?

[BB_cuda]

Not sure if you mean complete failure or on its way to going bad. If it's not producing anything, your brakes would be struggling along with turbo controls. Motor mounts too. Any other side symptoms to report?

[atwal187]

My vacuum pump has a slight leak as well, I replaced the O ring but apparently there is another ring you can replace, anybody had any experience with it?

[Yozh]

Check system vacuum at various operating modes. Hook up a gauge inline and monitor the behaviour during a drive. Good place to start.