How to Change an Oil Pressure Switch

The oil pressure switch is also known as the oil pressure sensor. It will cause the low oil pressure light to go on if it detects a lack of oil. An oil pressure switch isn’t infallible, however. It can become faulty and when this happens, you’ll need to replace it. It’s best to replace the oil pressure switch when you’re changing the oil because of the placement of the component.

Step 1 - Locate the Switch

The placement of the oil pressure switch will vary with car make. As a general rule, however, you’ll find the switch close to the oil filter or just under it. If you’re not certain, the best thing to do is consult the service manual for your vehicle.

Step 2 - Oil Change

Since it can be difficult to obtain good access to the oil pressure switch when the oil filter is on, changing the oil pressure switch as part of a service is suggested. To do this, place a large basin under the oil pan and open the drain plug with a wrench. Using an oil filter wrench, loosen the oil filter before removing it by hand. You’ll now be able to get to the oil pressure switch.

Step 3 - Removing the Switch

You’ll see that a connect cable goes to the oil pressure switch. Unplug this. There will be a rubber boot covering and protecting the switch.  This keeps dirt away from the switch. You’ll need to carefully peel it back from the switch and then push down on a tab. Doing this will let you unlock the connector to the oil pressure switch, and then you’ll be able to remove the boot.

While it’s off, take a rag and clean the contacts on the connector. This can help eliminate later problems. Fit your wrench over the oil pressure switch and add the extender handle. Loosen the switch and finish unscrewing and removing it by hand.

Step 4 - New Switch

If any oil spills when you remove the oil pressure switch, wipe it up with a rag. Screw the new switch in your hand, then tighten it all the way down with your socket wrench. Snap the connector on to the switch and roll down the boot so the oil pressure switch is fully protected. Clip the cable back onto the switch.

Step 5 - Oil

Take your new oil filter. Dip your finger in the old oil and run over the rubber gasket on the filter before you screw the filter onto the engine. Use the oil filter wrench to secure it firmly. Close the drain plug on the oil pan and refill the engine with the correct amount of new oil; your service manual will tell you how much to put in. Put the oil cap back on. Dispose of the old oil and filter responsibly. Switch on the engine and check that the oil pressure switch is work correctly. It should not come on if the work carried out is satisfactory.