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remove the battery terminal to clear the radio, then reinstall the cable, with the key on and the radio off hold down buttons #1 and #6 while turning the radio on, this will give u the serial # of the radio and u can give it to any dealership and they can give u the 5 digit radio code, If they wont just give it to me and I can help you.
----- Error code radio Honda Civic 2007 -----
power on radio, when you see Error code 1 or 2 or 3 ..., power off the
radio, press the keys 6 and 1 at the same time, and power on, you'll see
the radio serial number, write down this S/N and call your dealer, give
him this S/N, he will give you the code (5 numbers), that's it that's
You will need to remove the radio, and get the serial number, call the Honda dealer parts department, give them the number and they will give the radio code, that's the only way, hope this was very helpful.
if you call the honda dealership the will give you the code for the radio but they need a number form you they will either have you pull the radio and get the number off the back of it or have you hold presets 1 and 6 at the same time to get a number from the radio once they have that they can give u the code
P0420: Calayst system efficiency below threshold (Bank no. 1)
You can clear the code by turning your engine off, locating fuse number 12 in your under hood fuse box (backup, radio 7.5A) and pulling that fuse for about 10 seconds. If the code comes back, it was not a glitch and I would have the code checked out (has to do with you catalytic converter, I believe).
Hope this helps you.