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p1506 is an IAC (Idle Air Control) error code that comes on when your on-board computer senses an undesired Idle RPM.
Yep.
SOHC--Single OverHead Cam DOHC -- Dual OverHead Cam
If you change the whole engine.
single overhead cam
The 2011 Ford Focus has double overhead cam (DOHC).
The 2001 Ford Focus has double overhead cam (DOHC).
The 2008 Ford Focus has double overhead cam (DOHC).
The 2010 Ford Focus has double overhead cam (DOHC).
The 2014 Ford Focus has double overhead cam (DOHC).
The 2013 Ford Focus has double overhead cam (DOHC).
The 2004 Ford Focus has double overhead cam (DOHC).