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Hello, my name is***** you for the question. Can you tell me if the engine is making any noise at idle?
Thank you. If the light is still on then the sensor may be bad or you may have an issue with the oil pressure. If he oil has not been changed recently then I would start there as a dirty filter can cause this. If that is fine I typically check the pressure with a manual pressure gauge to see if it is within specs. If it is then the sensor should be replaced.
Then you will either need to get a mechanical gauge and hook it to the engine to see what is reads or simply replace the sensor.