Aerostar 2WD V6-245 4.0L (1990)
Oil Level Warning Indicator: Testing and Inspection
With oil level at FULL mark on oil dipstick and engine oil warm to assure that oil drains properly from oil sensor, turn ignition on and start engine.
Warning lamp should come on briefly in Start for bulb test, then go out. Turn engine off. Drain 2 quarts of oil from engine. Wait approximately 5
minutes, then restart engine. Warning lamp should come on and stay on. If warning lamp does not come on check fuse, low oil level relay, low oil level
sensor and lamp.
