It is in Odyssey manual page 324 (Maintenance minder). Under code B many things have to be checked including brakes, tires, tire rod ends etc. code 2 is to replace filters and 4 is to replace spark plugs and timing belt.
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If you have already tried to enter a code many times, and it doesn't work, do the following: 1. Disconnect the battery, 2. Connect the battery, 3. Put Radio ON 4. Enter the radio code of 4 digits, 5. That's all. If you don't have the radio code of your Honda Odyssey, have on hand its VIN, and ask your former salesperson or your former dealer.
First you need the code to enter. Check your owner's information for a business card with Anti-Theft Radio Identification Card at the top. There is a 5 digit code. Enter that using the number keys of your radio when you see "Code" on the digital screen of the stereo. If you don't have the code, you need to get it from a Honda dealership. You will need the system's serial number to get this.
You have to go to a Honda dealer and they will give you the code.
call Hinda and they will help you. You will need to code that is in the glove compartment. if you have the code just punch the number that you have on the radio numbers buttons and as soon as you finish punching the numbers your radio will work if you don't have the code contact the nearest Honda dealer and give them the VIN number of you car and they will give you the code for the radio normally this service should be free.
Open the trunk and check to see if the code is on the underside of the trunk lid. (That is where I find the code to my Honda Accord) If you do not have the code click the link, sign up at the Honda Owner's Link, and then click get radio code.