Hey guys, looking for some advice here. I have a 2002 F250 with the 7.3, with the CEL on. My wife bought me a ScanGauge 2 for Fathers day. It connects to the PCM and I can read data like TFT, votls, etc. When I scan the truck for codes, it tells me that there isn't any stored or pending codes. Can anyone help as to why this is?