2001 Lexus IS 300

Physically check your oil level. If oil level is good, then you have a faulty oil level/pressure sensor. Located on lower left front of engine.

Hello -

If I understand you correctly, your engine oil light was flashing on and off and the oil gauge goes up and down.

You replaced the oil pressure sensor and it still does this. . .. . .. . ..is this correct? And you have a oil pressure sender on this car. . .. . .. . .so this is what you are referring to as the sensor. . ...correct?

I have attached a check for the Oil Pressure Warning Lamp/Indicator. . .. . .. . .. . .please do that check.

INSPECT LOW OIL PRESSURE WARNING LIGHT
a. Disconnect the connector from the warning switch and ground terminal on the wire harness side connector.
b. Turn the ignition switch ON and check that the warning light lights up. If the warning light does not light up, test the bulb.

I have also attached the check for the Oil level Warning Indicator

INSPECT ENGINE OIL LEVEL WARNING LIGHT
a. Disconnect the connector from the switch.
b. Run the engine.
c. Turn the ignition switch ON, check that the warning light lights up approximately 40 seconds later. If the warning light does not light up, inspect bulb or wire harness.

I have also attached the check for the oil level sensor. . .

INSPECT ENGINE OIL LEVEL WARNING SENSOR

Check that continuity exists between terminals when the sensor-sensed temperature drops to 40 °C or less with the float down.

b. Heat the switch to above 60 °C (140 °F) in an oil bath.
c. Check that there is continuity between terminals with the switch ON (float down).
d. Check that there is no continuity between terminals with the switch OFF (float up). If operation is not as specified, replace the switch.

INSPECT ENGINE OIL LEVEL WARNING SENSOR CIRCUIT
Disconnect the switch connector and inspect the connector on wire harness side, as shown.
If continuity is not as specified, inspect the wire harness or ground point.

My thought is it may be the oil level sensor.