Hi
I have a 1993 Sedandeville 4 door 4.9l engine front wheel drive.

On random basis the SES light comes on and the DTC says it is a part/neutral switch issue

I was told the switch was under the aircleaner box which I took off and did not find it
I do not know what it looks like so does anyone have a picture of visual location or at least explain where it is, what it is near, and right, left, front back areas so I know where to look so I can try adjusting to see if that solves the problem

Backup lights come on when in reverse, no issues starting so assume it needs an adjust, maybe got some oil in it ?

Thanks for any help