Q: how do i program my spare key on 2004 Honda Civic

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
When I bought my Civic I received two sets of keys. Only one will start the car. The other works on everything except ignition
(1) Answer
(2) Comments
You car is still under warranty, right?

This is something that the dealership should fix for you under warranty. It sounds like a problem to me.
That's not good news--makes it a little more complicated and probably expensive. I'm not sure that anyone but the dealership can help with programming keys.

I would give your local Honda dealer a try and tell them it never worked correctly. If the price is too high, perhaps a local Honda specialist can help with it. Replacing keys can be well over a hundred dollars. With luck, that won't be necessary!