Engine Oil Pressure Warning Light On?

Oil pressure sender is on block behind AC/Alt. Bracket.
It has a one wire black spade connector

You will have to remove the brackets to unscrew the oil pressure sender, screw in a mechanical gauge and measure oil pressure, if low then possible bad oil pump, clogged oil galley, or main bearing issue.
Remove valve cover and inspect top of head, if there is significant sludge build up, the oil pump pressure release spring may not be working bypassing oil to engine and dumping it into oil pan, or main bearing issue.

If oil pressure from mechanical gauge is OK then replace oil pressure sender.

If bearing problem, then get a used engine from a 90-92 Toyota Corolla/Geo Prizm and replace the engine.

You can usually get a good used 4AFE for $300.
Make sure engine was from running car.
I have done this on several Toyota's and it is a good alternative to a reman'd engine, which will probably cost you $1600-2000.

Also make sure you get same engine i.E. Toyota made two 4AFE engines, one with EGR (CA. Only) and one without (called Federal/Canada).

Double check your oil level, a little bit of a low engine idle can cause this. The oil light sender switch could be out of calibration and needs replacement. I would not panic over it if you have oil in the engine.

Might also want to have the oil pressure checked with a manual gauge to be sure it is good

When the oil pressure checks out normal-test the oil pressure sending unit circuit if okay-replace the sending unit

If the light continues to come On-there's an engine internal problem -such as oil pump/engine bearings/oil galleries/sludge in the lubrication system.

The oil pressure sender is behind the alt/AC bracket on block, a one wire connection. Either the wire is loose, the sender is bad, or you have low oil pressure.
Check oil pressure with mechanical gauge, if OK, then sender or wiring to it.

Get this fixed ASAP, if you do have low oil pressure, you will damage the engine beyond repair.

Hi,

You need to have the oil pressre tested first. There are a few possibilities :
1. Faulty oil pressure switch.
2. Clogged oil pump strainer in oil sump. You need to drop the oil pan to check.
3. Oil pump weak, pressure test would confirm this but you need to check for clogging first.

Hello,

The flickering could be just the oil switch going bad or just a loose connection. The only damage it will do is not let you know when the oil is low or your oil pressure drops out.

I would highly recommend having you oil pressure checked.

.

Checking and replacing the oil pressure switch would be my 1st step

To add to the excellent advice BMRFIXIT gave:

The oil pressure switch is located on block behind alternator, a one wire connector. I would also remove it and measure oil pressure with a mechanical gauge, if low then oil pump, or excessive clearence in bearings.

Check the oil pressure with a mechanical gauge, if normal replace the oil pressure switch. If abnormal could mean oil pump and/or engine bearing.

Check the oil pressure with a mechanical gauge to verify it has low oil pressure.
This is done by removing the oil pressure sender and screwing in an adapter in its place connected to a mechanical gauge.