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From The Saab Tech Wiki
/* Replacement Procedure */
==Replacement Procedure ==
Removing the oil filler tube will create more space to access the pressure sensor. It is attached using 2 10mm bolts at the valve cover and a 12mm bolt to the engine block. The oil filler tube can then be pulled from the sump. Without interference from the oil filler tube the sensor can be removed using a 24mm or 15/16" deep socket. Replacement sensors may vary in size.
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