Hello there

I have a 2005 Vectra CDTi150 design with factory fitted parking sensors. Recently they just stopped working altogether, front and back. I have checked the fuses and both are good. I can see no physical damage or dirt on any of them. For front and back to fail simultaneously would it mean a control issue rather than an individual sensor fault?? If anyone has had an issue with this system before or has any tips I would greatly appreciate it.....
Best regards
Neil C