Try this site; It usually has all codes. http://www.dtcsearch.com
it usually has also good descriptions of the fault, like when it is set.
Alternatives are: http://www.aboutautomobile.com/DTC and http://www.eobd2.eu/DTCL.asp
These 2 sites sometimes have P1xxx codes for Ford that the 1st does not have.
P042F - Exhaust Gas Recirculation "A" Control Stuck Closed
P115A - Fuel Stepper Motor Fault
p0313 - Misfire Detected With Low Fuel
p0490 - Exhaust Gas Recirculation "A" Control Circuit High
p1412 - (EGR) Valve Frozen

Start with cleaning/replacing the EGR valve. It may lead to strange mixtures and misfires.