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I would check the oil pressure sensor itself first before chasing after
a short/open in the harness. See if it is covered in oil from a leak
somewhere. Or the plastic connector itself may have become brittle
and loose.
Also, do the obvious if you haven't already. Check your oil level.
If everything seems ok, this is probably one of those parts which
is cheap enough you can just try and replace to see if it takes
care of the problem.
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