ZitatQuestion is, could it be that some connectors or cables are loose?
I don't believe that.
The cause of the error may be that your PDC sensors are oxidized.
These sensors are often rotten under the paint. You can tell when small bubbles have formed.
You can solve it yourself by carefully sanding the sensors, then masking and painting over them. I think you only solved the problem for a short time by washing it.
....just my guess.
Best regards Robbi