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had that warning on my 12c a few months back. i had just washed the car the night before . early next day it alarmed this message a few seconds after start up.
stopped it and restarted and message was still there but engine did not make any noises that would indicate low oil pressure.
drove for about 25 minutes and message went away only to come back 15 minutes later for a few minutes and it finally went away for good and has never come back.
water and oil temp all indicated normal.
my bet is on a defective sensor,wirinng, water etc...
when oil pressure is low,you will hear the valve tappets ticking away just like they do at start up after car has sat overnight or longer.
 
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