check the gas cap or the intake filter...
The 2012 Scion xB has an inline 4 engine.
The 2014 Scion tC has an inline 4 engine.
The 2013 Scion xB has an inline 4 engine.
The 2008 Scion tC has an inline 4 engine.
The 2011 Scion xD has an inline 4 engine.
The 2014 Scion xB has an inline 4 engine.
The 2009 Scion tC has an inline 4 engine.
The 2004 Scion xB has an inline 4 engine.
The 2013 Scion xD has an inline 4 engine.
The 2008 Scion xD has an inline 4 engine.
The 2010 Scion tC has an inline 4 engine.
The 2012 Scion iQ has an inline 4 engine.