Emission Control System lit up?

Hey Guys,

I've recently had the Emission Control System light on my dashboard turn on and stay lit in my Audi A4 Cabriolet (2004, V6).*

I've read the fault codes but am not that knowledgable so was hoping you guys could give me an idea what I'd have to expect if I were to bring it down to a mechanic. A vague idea whether it's a minor issue or potentially expensive would be great.

Please find the fault codes listed below with a link to Ross-tech:

17645/P1237 - Fuel Injector for Cylinder 1 (N30): Open Circuit
http://wiki.ross-tech.com/wiki/index.php/17645/P1237

16825/P0441/001089 - EVAP Emission Control Sys: Incorrect Flow
http://wiki.ross-tech.com/wiki/index...5/P0441/001089

18010/P1602/005634- Power Supply B+ Terminal 30: Voltage too Low
http://wiki.ross-tech.com/wiki/index...0/P1602/005634

This fault was also read under ABS but not related to Emission control system I believe:

01826 - Sensor for Steering Angle (G85); Supply Voltage Terminal 30
http://wiki.ross-tech.com/wiki/index.php/01826

I'd really appreciate it if you guys could let me know what all this means, especially how much you think it may set me back?

Thanks guys, much appreciated.*