Sorry to resurrect an old thread but I am also getting the error 2 message multiple times during my commute. There is not error upon 1st power up of the ALP, but during my commute the error occurs several times. I pulled the stats file and it shows dual heads being connected and functioning properly. Any advice on how to rectify this problem? Firmware: 4.5.2, sensors connected to port F1 and F3 because F1 nad F2 was giving me the same error 2 message. All other setting are factory default.