My reverse sensors aren't working at all at the moment, happened about a week ago and I washed the car and they started working again. They stopped working again the other day....long beep and unavailable in the car menu. Washed it again still not working. Any suggestions?

Was a car wash or did you do it by hand?  Those great bit whirling rollers may have caused some damage to the sensors?

Hand wash...them roller things are lethal

Try checking the plug at the back of each one. It is likely that one of them has come loose, mine did and it was just a push in to get them working. Its a pain to get behind them though!