I am having an issue with parking sensors on a 2008 FR-V EX. When you put the car in reverse you get a long tone for 2-3 seconds then nothing. I bought the car like this so am unsure what it could be. I did read elsewhere on the forum to put in reverse and listen for the sensors clicking which I can't hear. I had an auto electrician I use for faults plug his computer in but it wouldn't scan parking modules. I was thinking to buy a HDS clone off ebay is this a good idea? Honda want to charge £65+VAT to plug the car in so my thoughts was the HDS would pay for itself. Otherwise I could take the rear bumper off and clean the terminals etc but would rather pinpoint the problem first. I would also prefer to fix than replace the whole system with aftermarket. The car also has a detachable towbar but is removed at the moment in case this could be related. Any thoughts?