My CE light came on and LED ck indicates codes 2, 5, 8 and 17.

2 = oxy sensor inoperative
5 = EGR inoperative
8 = coolant temp sensor open or short circuit
17 = CAN data exchange-malfunction betw. control units

After a search of forum articles I plan to: ck vac lines, ck EGR valve w. hand vac pump, ck o2 sensor w. DVM as prescribed by A. Dalton.

I am wondering however if anyone has encountered this string of fault codes and can steer me to the likely problem source. All input is appreciated.