Guessing you mean cde P0404, which refers to the EGR (exhaust gas recirculation) system.
This will not cause your other problems though, are you sure you don't just have a flat battery?
fff50
April 2012
goole it and it tells you. unless you have a good quality reader with live data you may not see the problem
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.