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From The Saab Tech Wiki
/* Replacement Procedure */
==Overview==
The oil pressure sensor operates as a switch, at a fairly low pressure compared to normal oil pressure with the engine running. The warning light on the instrument panel should turn on with ignition before start, and turn off as soon as the engine is on. There is no other indication of a failed sensor. Even a flickering oil light while driving is an indication of dangerously low oil pressure, and imminent engine damage if continuing to drive. Low oil pressure can be the result of low oil level, and on some cars a seriously sludged engine, blocked oil pickup screen, or damaged oil pump.
[[file:900_9-3_Oil_Sensor_2.gif|thumbnail|none|Fig. 1 - Oil Pressure Sensor Diagram]]
It is located on the back of the engine block, with a single wire connecting it to the instrument panel. Leaks from the sensor can be hard to distinguish from leaks at the oil filler tube o-ring seals, or the valve cover. The sensor is similar to the oil drain plug, with aluminum gasket. The same sensor was used on the C900, NG900, 9k, and 9-3 model from 1985-2002.
[[file:900_9-3_Oil_Sensor_3.jpg|thumbnail|none|Fig. 2 - Oil Pressure Sensor]]
==Oil Pressures Table==
[[file:900_9-3_Oil_Sensor_1.gif|thumbnail|none|Fig. 3 - Oil Pressures Table]]
==Testing==
==Part Number==
* P/N: 9112459 ==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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