Error code
 

Hey guys if you could help out.

I got the check engine light and went to Auto Zone to get the code this is what I got:

P0299
Turbo/Super charger underboost

Right before I went to get the code the light actually went out but the code was still there. Anyone have a decent idea of the problem?

Is this going to be a series of troubleshooting or could it really be something major? I think since the light went out that it might not be that major but this is my first Volvo.

Anything will help!

Thanks

2004 S40 1.9T LSE

Check your vacuum lines to the turbo.