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There are known cases where the wiper motor creates RFI that interferes with the CMP sensor signal. I personally have only seen two over the years. I have also read that a bad wiper motor ground can cause this as well. Something to look at...
 

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I have experienced it.
It was when I changed to a particular CPS. The fix was to open the harness to the wiper motor and install ferrite chokes around the wiper wiring.
Or change to a Ford CPS like RT suggested. I would also check the wiper motor ground like ford_doctor suggested.
 
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