doxviper

At start up, I recently have gotten a notice to 'check park aid'. When I go to the screen for rear park aid or front park aid, neither one is highlighted so I can't turn either one off or on. I've noticed recently I haven't gotten the chirps as I pull into my garage like I used to, so the sensors aren't working. Is there a fuse for these? Could both sensors have gone bad? Both front and rear have had minor bumps recently but the sensors look okay.