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The code A123, in your 2008 Honda Odyssey, is a reference that the air filter may need to be changed. A code should reset after changing the air filter.
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how do i get a code for my 2007 honda odyssey 2007 if i have the serial for the radio
For the 2007 Honda Odyssey it is located under dashboard between the steering column and the brake pedal.
A P1399 code is a cylinder 1 misfire code
It could be in the owner manual.
Oil Change Time
code 122
Trouble code P0780 means:Shift malfunction
Trouble code P0420 means: Secondary Air Injection System