2012 Honda Odyssey - Doing the timing belt, should I add plugs to that?

Don’t forget the transmission fluid. With all that’s mentioned above, this could easily turn into a $2000 maintenance job. When I did the timing belt on my 2005 Accord V6, I asked about the pulleys, tensioner, and oil seals. The dealer said they don’t usually do them, would inspect them, and call me if they needed attention. No calls and no problems after an additional 80,000 miles when I sold it. The trans fluid can wait for you next oil change, but should be changed at least as often as every 60,000 miles IMO.