Hi I just got into my car this morning and it wouldn't drive right so I put in the computer and got these two codes... can someone tell me what they mean and if it is going to cost an arm and a leg.... thanks P1580 and P0103

 

P1580 means Throttle Actuator B1 Malfunction. Which that is part of the throttle body. I would recommend getting throttle body cleaner and get a small brush that can remove the carbon build up. Then wipe it of.
P0103 means Mass or Volume Air Flow Circuit High Input. For this code, try checking if the air intake booth has a vacuum leak and also check all the small braided hoses. If you find something, then replace them.
This is a cheap way to start and see if that takes care of the codes of your cabrio. Because a new throttle body is very expensive.
If you need more help, just let me know...