Could just be the sensor. It is either attached behind the front plate or the bumper...depends on year so I am not sure about yours. You could try probing the connection when it is on maybe?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k