Audi A1 1.6 TDI 77kw CAYC
I have A 2011 Audi A1 1.6 tdi 90k miles with low oil pressure warnings flasing up regularly when it warms up. It's only measuring 10 psi at cold tick over and it doesn't increase with revs. New oil and filter didn't change anything so sump off and found no clogging in the oil pickup mesh. Nothing obvious wrong with the pump and no metal debris found. Big end bearings no play. Is there a pressure regulator in the system that could be operating too low? If so where is this located. Is there a pressure relief valve in the pump that could be passing oil at low pressure? I can't seem to find any info on how the oil pressure is regulated if indeed it is.