Re: 2008 Civic Check Engine Light
Find Honda service bulletin 08-013. (I did not find it on a quick Google search.)
Maybe try ALLDATAdiy.com, or your local library. Many libraries have access to Alldata and/or Mitchell service information.
The bulletin tells about the EVAP purge valve as a possible cause.
Gives VIN ranges of affected vehicles
Tells how to inspect it and properly diagnose it.
Tells how to replace it if it is actually found to be bad.