po442 and 1684 pop up on my dash any ideas

 

P1684 code simply means the battery has been disconnected within the last 50 starts. This code will goes away.

P0442 Evap leak.
It is not very important. You won't feel the different after you fixed it. Your car will idle just a little bit lower:
- Check if any hose is unplugged from the throttle body.
- Check the purge solenoid.