Oil light on at idle and flickers when slowing down

There are a number of things that can cause this but if the oil level is not low then we need to rule out a sensor issue.

Here is a guide that will help with this:

https://www.2carpros.com/articles/high-or-low-engine-oil-pressure

If the sensor is the issue, then we will have to prove this by putting a gauge on the engine and confirm the oil pressure is actually low.

If it is not, then you need to replace the sensor.

If it low, then we most likely have a restriction in the system or a failing oil pump.

Also, I am attaching the process from the manual on how to test the sensor itself if you would rather check it this way.

Let's run through this info and we can go from there.

Thanks