Yes its a known problem, there are hundreds of posts about it if you care to search. Location is left hand side top of tank after the tank cover is removed. If you look from the front under you can see a big round cap, its under there. Some say you need to get it fitted and calibrated by a dealer and some say you can just fit it and it will be ok. Pays your money and takes your choice really. Other choice as many do including me is just ignore it and use your trip meter.