Look in your owner's manual. It always says in there somewhere. I didn't know this till my Honda dealer told me, and I've never run across a Honda since that this was not true for. I have a 2004 CR-V, and in my manual it's in the Instrument Panel section, under the Maintenance Indicator Light.
The following process worked like a charm for both my 2004 CR-V & the Honda Accord I had before it. See if it works for your Odyssey. But if it doesn't, I guarantee the info is somewhere in your owner's manual
1) Turn off the engine
2) Press & hold the Select/Reset button on the instrument panel (the bar-type button to the bottom right of the speedometer), then turn the ignition switch to on.
3) Continue to hold the button for about 10 seconds until the indicator light goes off.
Good luck!
How do you reset 2008 honda element service light?
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.
Honda's maintenance minder says to, "refer to Civic Sedan's owner's manual."
The 2008 Honda Odyssey has a V6 engine.
The 2008 Honda Odyssey has 24 valves.
The 2008 Honda Odyssey is a gas-powered vehicle.
The 2008 Honda Odyssey has a 5-speed automatic.
The 2008 Honda Odyssey has single overhead cam (SOHC).
The curb weight of the 2008 Honda Odyssey is 4385 lbs..
The maximum payload of the 2008 Honda Odyssey is 1322 lbs..
The 2008 Honda Odyssey is 16 ft. 10.1 in. (202.1 in.) long.
The height of the 2008 Honda Odyssey is 5 ft. 8.8 in. (68.8 in.).