Does the SEL mean “service engine light” ??
I would guess so, butt why not check the owner’s manual?
SES==standard efficiency son
SEL==standard efficiency lover
or maintain them Fords regularly and you will get economy of money and time in return
been driving them Fords for 57 years and maintained regularly w/o any major problems. Had one of those popular auto’s early on, it was so bad they had to change their name.