Are you the original owner? Has it always done it? How many miles? What engine? Does it go away as the engine warms up? Where is the sound coming from? Need more information.
Like the title says, what made you smile today, or who?Me? Getting to see my mom and dad with both kids and their significant others. Really lights my moms smile up when all her grandkids can get together. Also, my good friends!
Carry on.....
Most likely a sensor problem. A special scanner is needed to read those codes. If you don't have one or know anyone with one, you will need the dealer to service your vehicle. Just know that with that light on, the air bag system is disabled and will not deploy in the event of an accident. Welcome to the forum.