1 – Repeated Blinking from the Oil Pressure Light

Sometimes if the oil pressure sensor is not working properly, there will be blinking from the low oil light on the dashboard. 
In order to determine if this is a real warning or not, you should manually check your oil level to see if it is low. If it isn’t, then it is likely you have a faulty oil pressure sensor and you need to replace it right away.

2 –The Oil Pressure Light is on

If the Low Oil Light comes on, but you check the oil in the engine and it’s at a good level, then a faulty oil pressure sensor may be to blame.
When this sensor goes bad, it will start to give inaccurate readings. After the readings fall out of specification, a warning light is set.

3-Oil pressure gauge is at zero

If this gauge is reading zero even when oil levels are where they need to be, then the oil pressure sensor is probably to blame. Modern cars that have a oil pressure gauge use an electronic signal. The gauge may sit at zero, full, or have erratic readings when the oil pressure sensor is failing.