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My 2008 C2 Thomas Freightliner school bus with mercedes engine keeps cutting off while driving along with the check engine light coming on . It will cut off in the middle of the road and then come on again when I start it and then it runs for few minutes and cut off again. I actually get these buses shipped to Liberia for rent and there is no mechanic that does good diagnosis there. So, they all cannot diagnose the problem. I thought it was DFP filter being clogged or the EGR valve being cut off but, we disconnected the exhaust from the engine and it is still cutting off after running for fewer minutes. I actually thinking on buying some parts to throw on it but, I get not many clues of what the problems are. I plugged the computer to it and it reads these codes : "SID 0155 COUNT 67 FMI=0 DATA VALID BUT ABOVE NORMAL OPERATIONAL RANGE-MOST SEVERE LEVEL. What could really be the problem and what do I need to solve it? Can someone please help?