The following results are the same on either W7 or XP. Currently using XP on a 10 inch notebook. The invalid codes are 48,49,50,56,57,67,69,256,322. I have an ISB275 5.9L. These codes do not correspond to the codes listed for cummins. So my question is. Is there some way I can build an exclusion file in the software to ignore these codes. This will make diagnostics a little cleaner. No apparrent problems with the engine.