Hello Ken,
generally, this situation happen when the sensor oil reaches the end of
its life. As soon as the pressure in the engine increases, the sensor
give a fault. if it does not change, the sensore oil will continue to
give a false signal and at some point the indicator light will remain
lit at permanance.
I already had this problem, *but not with the audi*, the best is to
scan.
when you have the answer, please told us how you have repaired the
problem.
thanks
--
leon
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