I replaced my front bumper with a black one and new black sensors. Now I get an error message to service front sensors and the ParkSense is turned off. I cannot turn it back on with the switches. The front switch flashes and the stays lit (off). The back one just stays lit (off). I replaced the original sensors thinking maybe I had a bad one. No luck. Does anyone have information that would help me before I decide to have the dealer look at it? Thanks