CLK V6 Engine Code Help

[Red Leader]

My Streetwize OBDII reader came today and after checking the car I have 3 Codes and 2 Pending:

P0106
U0155
P2006
P0106P
P2006P

First time I have used a reader and so this is new ground to me. First question is....can I still drive the car with these codes? and has anyone got any help/tips/info to help me sort them out?

I do not think any of these relate to the Balance Shaft issue??

Cheers