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I have a 2005 Buick Lesabre and just started having the oil pressure light come on and the pressure readings fluctuate wildly between 0 and 130. Car runs great and not making any weird noises. Oil level is fine and was planning on an oil change to be done this week as I am due. I have been reading other posting and sounds like a bad sensor to me..... I will have it looked at on Monday but was wondering what your thoughts were so I don't have a heart attack when I get the car checked. Thanks

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Posted on Jan 02, 2017

ginko
  • 19396 Answers

SOURCE: fluctuation on the oil pressure gauge reading

The oil pressure sending unit is a sensor with an internal diaphragm, if the internal diaphragm is damaged , or the line to the diaphragm is blocked you can get this kind of fluctuation on the oil pressure gauge.

The oil pressure value must be read by installing a mechanical gauge near to the oil pressure switch and checking the pressure.

If pressure is ok, replace the sending unit. If there is a real pressure drop, check the oil pump.

If you still get fluctualtion after replacing the oil pressure sending unit, replace the oil pressure gauge.

Posted on Nov 24, 2008

  • 40 Answers

SOURCE: My 02 Jeep runs great but oil pressure reads High all the time

oil pressure sending unit is not working right.

Posted on Mar 08, 2009

  • 1 Answer

SOURCE: Oil pressure sensor light comes on and oil level is fine

This is probably an oil pressure sensor problem.  Randomly going from 0 to over 130 is means the sensor is putting out out of range signals.  Mine would even read --- at times.  I told the mechanic to not spend any time troubleshooting just change the sensor.  $121 including parts, labor and tax.  The gage should read about 70 psi plus or minus several psi, and move up a PSI or two as you rev up the engine.  It took him about 10 minutes to change it, once he got the part.  There would have been a diagnostic charge of about $50, had I not been sure.

Posted on Apr 13, 2009

  • 104 Answers

SOURCE: OIL SENSOR LIGHT ON 2001 Audi 2.8liter

It could simply be maybe the person changing your oil never reset the light? or you have a oil pressure sensor leaking or not working.
most of the time its someone never reset the oil change light. even before it goes on it goes by mileage, so maybe it didnt go off yet cause you cnahged it a tad early.so noone even tried to reset it.

I guess you could have an oil pressure problem, but thats going the extreme route.. but if nothing else shows that could be a problem.

Posted on Apr 29, 2009

Molson02536
  • 3854 Answers

SOURCE: Low oil pressure light goes on until car warms up. Oil level is good

The oil pressure sending unit has gone bad. I sending unit is just above the oil filter and you can get to it from the top. When you face the Engine look down towards the oil filter, the oil pressure sending unit is just above that and it looks like a cylinder with two wires coming from it. If you don't see it, it's right between the exhaust manifold and oil filter.
If you go to Auto Zone or Parts Source, they'll have the oil pressure sending unit and the step by step instructions, When installing the new sensor. Do not use teflon tape or any sealant, the sensor is tapered and need's the good ground from the engine to give you right readings.
Good luck and hope this helps.

Posted on May 11, 2009

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You will need to connect a pressure gauge to the engine to read the true pressure.
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You should have new oil and filter. A bad filter can cause pressure drop.

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