my check engine flashes a code of 1 2 5 5, will someone be kind enough to tell me what it means,Thank you in advance!!

The following link explains the codes:

http://www.allpar.com/fix/80s-codes.html

Each code is two digits
You have code 12: (battery recently disconnected - informational message) and code 55: (End of code list - informational). I.E.: no faults

Yep, you have no real error codes. Hope it stays that way for you.