Was driving slowly today, following a slow vehicle, kind of start/stop. Check System came on. I've checked the F-CAN menu and it displays: Error Active OK UNIT ID Meter 1F4 Not sure if this is significant. The Check system appears on the dashboard display. It's nothing obvious. The car drives and sounds as usually. It's not low on oil, or overheating. Can't make it out. Trying to book it at Honda dealership to have it checked. Any ideas from that F-CAN code? - - - Updated - - - Update: Read somewhere to disconnect the battery for 10 mins. Did so, returned to the car, and was still showing up error. Phoned up dealers and booked a visit on Thursday. However, when I later got into the car to drive home, after about 30 seconds of running, and while setting up nav language etc, the error has gone. Did not come up on my way home. Maybe it's gone for good. Still thinking about seeing dealers to see if they can pull the code from history to give a clue of what was going on.