The oil pressure switch on the engine of your Toyota Camry detects the oil pressure in the engine block and converts it to milliamps. The information is then sent to the engine's computer and on to the gauge on the dash. If the pressure falls too low, the computer may shut the ignition down, causing the engine to stop. If the switch fails, it may send incorrect information to the computer, making it impossible to know if the pressure is sufficient to properly lubricate the engine.
Open the hood of your Toyota Camry and disconnect the negative battery cable from the battery with a wrench. Set the cable aside so it cannot touch the battery cables.
Locate the oil pressure switch on the back of the engine, just below the valve cover on the side of the engine block. The switch is a round metal piece that threads into the block with a plastic connector on the top of it.
Disconnect the electrical connector from the top of the switch by pushing in the locking tab, then separate the connector from the top of the switch. Lay the connector aside.
Remove the switch by rotating it counterclockwise with a wrench and discard it. Thread a new switch into the hole on the block and tighten it with a wrench until it is snug. Push the electrical connector onto the switch, making sure it locks in place.
Connect the negative battery cable to the negative battery terminal and tighten the retaining bolt with a wrench. Start the engine and verify that the gauge on the dash is now functioning.
