Hello Ken,

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

--
leo