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Oil pressure light on only when under 1000 rpm

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Hi guys,

i have 2010 Ford Fiesta diesel,

when revs fall below 1000 oil pressure light comes on. 

When I rev over 1000 it goes off! 

No signs of any leaks and oil full on dipstick.

car running really well otherwise.

any suggestions to what is causing the low oil pressure light to come on at below 1000rpm? 

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 worst case possible oil pump,  oil filter blocked old oil needs change, oil leaks, crankcase ventilation blocked or restricted, potentially any of theses.This needs to be rectified before possible engine damage. Or something as simple as the oil pressure switch faulty that is not so bad and easily fixed perhaps try this one first.

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