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My reverse sensors haven't been working for quite some time when it goes into reverse it comes up with parking assistance system fault with the engine light on then disappears after a beep.i read some where to plug in a obd2 reader and clear the fault?I have also tried the wd40 trick but to no avail.when In reverse I bent down to listen to any 'clicking' from the sensors but no noise from any of them any help would be appreciated thanks