Hello. Recently i've got volvo xc70 and xc90(both 2007) and on both of them showed up message that i need to check my parking assist sensors. I checked with delphi ds150 and it showed that i need to change 4th and 3rd sensors. After change, that message on dashboard haven't gone. When i checked with pc, it shows that i still need change 4th sensor(4F45 fault code). I changed park assist module, but it didn't changed anything. On both vehicles is same problem, checked wires, all are good. Button to turn on or off park assist does not work too. Maybe someone have been in my place and knows what to do? Would be gratefull for any info!