Egr control faulty signal
 

I have a 1998 Volvo s40 1.8L . I have been having starting problems. Here are the codes I have.
EFI 123 ECT sensor
ECM 1408 EGR CONTROL FAULTY SIGNAL

Could someone help me out on the location of these sensors? A picture would really help. These sensors probably need a good cleaning. :) Thanks