1995 Toyota Previa Logo
Posted on May 12, 2009
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Oil Pressure light stays on. Oil reservoir is full,oil level light goes out and dipstick shows full oil. What could cause this?

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  • drtruthman May 12, 2009

    NO, I have not checked the oil pressure sending unit. How do I do this and where is it located?

  • drtruthman May 12, 2009

    So if the sending unit is good, then the oil pressure is low. Is this usually caused by a faulty oil pump or what ?

  • drtruthman May 12, 2009

    320,000 MILES

  • drtruthman May 12, 2009

    320,000 MILES

  • Anonymous May 11, 2010

    Don't know specifically on this engine where it is. It's about the size of spark plug with a wire connected to it. It'll be screwed into the block -- that's about all I can tell you.



    You can test it by removing the wire and checking its continuity with the engine running. If there is continuity, (in your scenario) it's bad.

  • Anonymous May 11, 2010

    Have you checked the oil pressure sending unit?

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  • Posted on May 12, 2009
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It occurred to me that you may find it by unplugging wires on the few items under the hood which may appear they could be the oil pressure sending unit.

The light should go out when the wire is unplugged, and if it does it is bad. That's your continuity test.

If you unplug the oil pressure sending unit and the light does not go out, the cause of the oil light staying on is something other than the oil pressure sending unit.

RE pete cass posting: I believe that if the sensor is diconnnected, the oil pressure light will not light (at least because of the oil pressure sensor switch being disconnected) -- the symptom here is the light won't go off. The switch is closed with oil pressure below 10-15 PSI and open above that oil pressure -- this is a normally closed switch.

  • Anonymous May 12, 2009

    Yes, if the sensor is good the oil pressure is low. Cause is not usually the oil pump, it's worn bearings, rings, etc.



    How many miles on the engine?

  • Anonymous May 13, 2009

    Wow!! I'd say it's a good guess your oil pressure sending unit is good -- but I'd check it anyway.



    Have you tried an oil additive for high mileage engines (I mean really high-mileage engines)?



    The engine is worn and the oil is "slipping by" everything its oiling. Don't know (no way for me to know) whether it's worn enough to drop the oil pressure to 10 psi, but it could be.

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  • Posted on May 12, 2009
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The oil pressure sensor may be failty or the wiring to the sensor is shorted or disconnected.

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