Had my battery changed and now radio isn't working. It says err. Is there a code to plug in? 1999 honda accord. Thanks ...

check fuse
check connections to rear of radio.
if good the Radio is inop. get it fixed.

Nobody is supposed to have the complete database of codes, only authorised dealers. As a security measure, any time the battery is disconnected, the radio is Locked Out, and will not function until the security code is entered on the radio itself. Furthermore, after 3 tries, it wont even accept the code on the radio display, showing the ERR condition. Check for a sticker with the radio code inside the glove box. Some dealers fixed a second sticker in the owners manual. If not available, get the code from a Honda dealer, and be prepared to show VIN number, and proof of vehicle ownership.When you get hold of the code, disconnect the battery for 15 min. This will erase the ERR condition, and allow you to introduce the reactivation code.

As a security measure, any time the battery is disconnected, the radio is Locked Out, and will not function until the security code is entered on the radio itself. Furthermore, after 3 tries, it wont even accept the code on the radio display, showing the ERR condition. Check for a sticker with the radio code inside the glove box. Some dealers fixed a second sticker in the owners manual. If not available, get the code from a Honda dealer, and be prepared to show VIN number, and proof of vehicle ownership.When you get hold of the code, disconnect the battery for 15 min. This will erase the ERR condition, and allow you to introduce the reactivation code.

Disconnect the battery for thirty minutes, and then reconnect it, then try to enter the code that was given to you.

Check for a sticker with the radio code inside the glove box. Some dealers fixed a second sticker in the owners manual. If not available, get the code from a Honda dealer, and be prepared to show VIN number, and proof of vehicle ownership.

look in your owner manual there is a reset code for the anti theft, im sure of it. let me know if you have questions about my answer, thanks.

the whole sequence has to be entered fast. No pauses.

This is the Radio Anti Theft feature which is activated whenever there is a complete power loss to the radio (as in when it is stolen out of the car). A Honda Tech or ASE Certified Auto Tech would have plugged in a Memory Minder into the OBDII slot to not only prevent this, but also protect the Main ECM from resetting which could create drivability issue.
If the Honda is now registered in your name, take it to your local Honda Dealer. They should be able to pull the Radio Serial number without removing it like in the older Hondas, simply a matter of pushing the right buttons. With the Radio Serial Number, Your Proof of Ownership (Registration) and a Photo ID that matches it, either the Parts Department Or Service should be able to give you a Radio Code for it.
As for the CD ERR codes, the CD player probably is broken and will need to be sent out by Honda to a outside facility to be repaired. That will probably run between $250 to $350, plus the labor cost to remove it and reinstall it.
If you just bought this Honda, or any vehicle, I always strongly recommend having a Manufacture Dealership do at least a oil change on it and check what other services may be due, you might also discover it has Recalls that have yet to be completed that they can take care of for you. Catch the little problems before they ruin that Great Deal you just got buying it.
Strongly suggest you also join Hondas “OwnersLink”, you can find it on the Honda web site under Owners Resources links. In the future you can use this to recover your Radio code after you’ve been registered for awhile. Also keeps you notified of Recalls, Service Issues and even sends out Discount coupons (Latest is a $119 trunk cargo trays for $39, that is a Fantastic Deal).
Good Luck

I need help fixing my radio on a 2006 Honda Accord...I could not find the code and after so many attempts my radio is saying ErrE and now i have found the code and now i can't start over with codes again....what can i do?

sorry for bad news, but please rate me fixya!
this is why shops plug in a cigarette lighter plug battery before disconnecting car battery...you can make one yourself...