Installed the seals today and it seems to be ok, will see when i will work a bit with the machine. However, BOSS now shows AF2 (Air Filter) again, both filters are new. In addition is shows AF6 (Air filter sensor). Does someone know how that sensor works, there is no description in the service manual. It shows up as a closed switch in the schematic but it is not closed (engine on or off). Cabling from the sensor to the BOSS unit is ok. I have not yet removed the sensor, that's open for next weekend ;.), should i order a new one ? Btw, is there a description of the symbols on the BOSS display (or is the symbol shown always the same as the code ?)