Does the 2003 Honda Accord 4-cylinder have an interference engine?

Yes. Your engine DOES have an interference engine. I think all Hondas do (or at least all the ones I have looked up!). You can go to www.napaonline.com to search for this, or on any other vehicle, as you view the timing components parts. If it shows a timing belt instead of a timing chain, it will also list whether it is an interference engine, or a NON-interference engine.