Hi and thanks for using 2CarPros. Com. Honestly, it sounds like the oil pressure switch itself has failed. I personally cannot imagine the over fill caused it, but that does not mean it is not possible. What is happening is the sensor/switch is leaking from the crimp. The result is loss of oil and an indication of lost pressure. The pressure should still be fine, it is just reading low because of a leak at the sensor/switch.
Should the shop be responsible? That is a tough call. I have no prior knowledge of the vehicle that could lead me to believe it was or was not leaking already prior to the service. I do not know if this helps or not, but if you were a regular customer at my shop, I would replace the sensor (which is not expensive) to try and make things right. That is me.
If you decided to do it yourself, here are directions and pics to locate the component.
SERVICE AND REPAIR
Removal Procedure
Tools Required
J 25254-10A Oil Pressure Sensor Socket
Disconnect the electrical connector from the engine pressure sensor/switch.
Remove the oil pressure sensor using J 25254-10A.
Installation Procedure
Tools Required
J 25254-10A Oil Pressure Sensor Socket
Install the oil pressure sensor.
Hold the oil pressure sensor fitting with a wrench to prevent from turning.
Using J 25254-10A tighten the oil pressure sensor to 30 Nm (22 ft. Lbs.).
Install the electrical connector.
Let me know if you have other questions. Also, I would like to know how things work out for you.
Take care,
Joe
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Sunday, June 3rd, 2018 AT 5:29 PM