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Park Assist Sensor Test
A little bit of info...
The Park Assist on my 2003 Windstar was not working when I bought it. I finally found a way to test the sensors without bringing it to the dealer ($130 for a diag). Put the parking brake on, block the tires, turn the key to "On" (don't start it), shift in reverse, put your ear near the parking sensors. You'll hear a ticking sound, like a spark plug, for the ones that are working. I found 2 bad sensors this way.
I also cracked open one of the bad sensors and found that they are not 100% waterproof, there was corrosion on the inside wires.
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