Engine light @ idle

[fivehole64]

I have a 2016 RXP 300 that the engine light comes on when returning to idle with audible beep. engine light goes out when rpm's reach approx 3K & any rpm above that.... engine light on again when back to idle.
1) Any idea?
2) How can I find fault codes? I have tried the mode button , Nothing..... I tried pressing the set button 5 times. Nothing.

Oil level good....

 

[ski-d00]

1. While the check engine light is on, scroll through the menu and there should be a new fault code section you can enter to get the codes. Once the check engine light goes off, the fault code menu will disappear.
2. Does it say oil or anything else when the check engine light comes on?

 

[xspook2]

Possible oil pressure sensor/switch going bad.

I once had the check engine light intermittently flash with no beeps or codes. Eventually, got a low oil pressure code at low RPM's.

Accelerating cleared the code.

Changed out the OPS and all was good.