For problems with low oil pressure after a cold start and the oil pressure switch is OK
Saab 9-5 (650) with DTH and DTR engine
At a cold start when the car has been standing for 24 hours or more, there is a warning on display unit saying low oil pressure. The low oil pressure warning goes off after 10 seconds as well as the "Service vehicle soon" message.
Action:
We have had some cases where the O-ring to the suction pipe for the oil pump / sump has been the cause for the low oil pressure warning. Replace O-ring, P / N 55589549. See picture below:
