You'll need to change the O2 sensor. Before replacing the O2 sensor be sure and check the wiring as that might be the problem. A short in the wiring or a loose wire will cause this code.
Trouble code P0135 means: O2 Heater Circuit (Bank 1, Sensor 1)
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Code P0780 means: A/T Concerns
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Trouble code P0135 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 1)
This code refers to the front oxygen sensor on Bank 1 which is before the catalytic converter on the #1 cylinder side. Inspect the wiring harness before proceeding.
Too many digits. Should only have 5 digits. Like P0135 which is O2 sensor heater circuit malfunction Bank 1 Sensor 1.
Fix the problem then you can clear the code.
The radio code is specific to the radio in your Honda. In order to get the code if you have lost the card the code was written on, and have looked in the owners manual, and in the glove box, you can get it for free. Just go to the Honda Owners web site and register your Accord. After your register your Honda click "Retrieve Radio/Navi code" on the left in the toolbar. Follow the instructions and Honda will tell you the code. Click the link.
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Trouble code P0117 means:Engine coolant temperature circuit low input
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