My poo11 and poo21 codes are showing up. What could it be an how expensive?

Looks like you have a variable valve timing (vvt) problem on the intake cam. This could be as easy as low oil or very dirty oil. It also could be an issue with the vvt solenoid or the phaser itself. If it is not the oil, a VVT solenoid is around $350.00 installed. But you need to have that checked out first. The phaser repair will be $1500.00 plus.