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Just changed battery in car, CODE !!! Here is fix: (for my 02 civic)
you need the numbers for the radio to get code from dealer, to find number:

Ignition on
power radio off
hold down 1 and 6 button on radio
turn radio on
2 sets of number flash, write em down.
Call dealership and give them those 2 numbers, they should give u code
(mine did)

If u have an "error" message, u need to disconnect the battery for 2 minutes to clear the error message before enter your new code.

 
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thanks for that info im sure i will need it someday, do you know how to change the clock in the car (i figured it out once but forgot) is it me or is it really complicated to change the clock

 
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Good to know, I'm sure some of us will need it someday, especially those who bought it as a second-hand.