The oil pressure switch is usually located on the engine block, often near the oil filter, and warns the driver whenever the oil pressure gets too low by illuminating a red oil light in the instrument cluster. Some vehicles use an oil pressure gauge in place of, or in addition to, a red oil light. The gauge uses an oil pressure sending unit, which enables the oil pressure gauge to read the full range of engine oil pressure. The full range generally runs from 7–12 psi at idle to and from 40–60 psi when the vehicle is moving.
How to Replace the Oil Pressure Switch
Note: The replacement procedure for either the oil pressure switch or oil pressure sending unit is the same.
- Disconnect the negative battery terminal
- Remove anything that blocks access to the oil pressure switch
- Disconnect the electrical connector
- With the proper oil pressure switch socket, rotate the switch counterclockwise
- Remove the oil pressure switch and clean the area
- Put some Teflon tape on threads of the new oil pressure switch
- Insert the new oil pressure pressure into its socket
- Torque the switch to specification and clean the area
- Reconnect the electrical connector and negative battery terminal
- Check the oil level and top off if needed
- Verify that the new oil pressure switch works properly by starting the engine