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Had this with mine car was fine but suddenly stopped illuminating .....was a failed oil pressure sensor
I have just noticed that my oil pressure light isn't coming on. I've run the dash illumination test (number 2 on the secret menu) and the LED is OK.

If you unplug the sensor the warning light stays off.

Time for a new pressure switch me thinks.

EDIT: new switch ordered.
 

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I fitted my new oil pressure switch this morning. Light now working again. Not a bad job. Easy to do at home on the driveway:

  • Place a drip tray under the car to catch the oil that will come out.
  • Remove the exhaust manifold heat shield for room to work and to better see what you are doing.
  • Unplug the sensor wire. Slide the clip and press to slide off.
  • If you wish you can test your new sensor by temporarily plugging it in and grounding it to the oil filter lid, the oil warning light should now work.
  • Use a 27mm six sided deep socket and carefully slide it over the old sensor. You can try it on the new one first to get familiar with how it goes.
  • Undo the old sensor. Remember that you are working backwards. This is when the oil leaks!
  • Thread in the new sensor carefully by hand. You do not want to cross thread it.
  • Tighten it carefully. It does not go all the way in. You will feel it go tight. Stop there.
  • Clean up.
  • any oil spills on the filter housing and on the car.
  • Plug the new sensor in.
  • Test by turning the ingnition on. Your light will show. It will go off when you start the car.
  • Replace the heat shield.
  • Clear up the oil drip tray.
  • Take a short test drive to check for leaks. You should be able to smell any hot oil, but be careful and make sure all is cool before sticking your fingers down to test!
Oil pressure switch highlighted in red:

Product Automotive lighting Font Auto part Motor vehicle
 
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