I bought a stock radio from the junkyard to fit in my 1999 honda civic. I need the radio code to make it work. My radio s.n. Is M98D316510. Please help. Thank

Go to a Honda dealer... show them the receipt for the radio as well as your vehicle registration and they can do this for you.

With the amount of theft there is around ownership has to be proven before this sort of assistance can be given for obvious reasons... as that code is an anti-theft deterrent.