Parking Sensors NOT WORKING... TRY THIS 1ST
To know which sensor doesn't work, insert the key into ignition and switch to position 2 then put the car into reverse. step out of the car and go to the parking sensors and touch each one individually and see which one is "sparkling" less than the other ones. You may have 1 or 2 or who knows maybe all (in which case you either have a wiring problem because you can't know which sensor is bad or they're all bad and need replacing). Its good to take them out from time to time (twice a year would be perfect) and clean with WD-40 or any other spray which doesn't leave residues

For more information on WD-40 go to https://wd40.co.uk/

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