Discovery II (LT) V8-4.6L (2003)
Oil Pressure Sender: Description and Operation
Oil Pressure Switch
The oil pressure warning light switch registers low oil pressure in the main oil gallery on the outflow side of the filter. Whilst the engine is running and
oil pressure is correct, the switch is open. When the ignition is switched on or if oil pressure drops below the pressure setting of the switch, the switch
closes and the low oil pressure warning lamp located in the instrument pack will illuminate.