Jesus Christ, things like this are pathetic. Not directing this at you alone, but it seems that people here can't look up stuff on their own and they always go off the deep end whenever their car beeps, rattles, or has a new noise. It is a freaking car! It is going to beep, it is going to rattle at times, and it is going to have some new noises. The thing is, if IT KEEPS DOING IT, then check it out. If you freaking car beeps twice at you and the no light comes on, keep driving a little bit and try to notice if something is wrong. Don't go and post this in a chat room, especially in the wrong room, right when you get home! WAIT A BIT AND TRY TO FIND THE PROBLEM YOURSELF! If your freaking check engine light is coming on, have you scheduled a time where you can drop it off at your dealership or something?
Cars don't fix themselves, buddy. If your car beeps and nothing else happens, then don't worry about it. If it keeps doing it, take it to a mechanic, not a message board.