What does the yellow tire light mean on the instrument panel?

Some cars have tire pressure sensors that can cause an indicator with an exclamation point to appear on the instrument panel.

Check the pressure in all of your tires.

Your car manual (probably crammed into your glove box somewhere) will have a diagram of all the instrument panel lights and a brief description of what they all mean.

if its the tire pressure light which looks sort of like this ( ! ) with a squiggly line under it, one or more of your tires either has too much air in it or not enough

low tire pressure, common in cold weather
hope it helps
may take a few days to go off (about 10 starts I think)

If the light came on and stayed on and its kind of shapped like (...) then i think its the TPMS light. Tire pressure monitoring system. Check all the tires on your car ( including the spare) once you have checked all the tires and found the one that is low, find the small round black button under the steering column and while the car is running, push and hold the button untill the yellow light goes out.

It means you have a tire that has low air pressure air up the tires and it will turn off automatically. Assuming you have radials stop at any gas station and air them up to 32 PSi for firmness and better fuel mileage or 28 PSI if you like going around corners a little faster cause the tire to grab the road better. Also any tire shop will air them up for you if they are not busy.

It is your tire pressure light

I'm not sure what year you have but this color code works for 87-93 mustangs.

Radio Connector:

Light Green / Yellow - Hot at all times (Fuse 8)
Yellow / Black - Hot in ACC or Run (Fuse 11)
Light Brown / Red - Goes to instrument panel dimming rheostat (Fuse 4)
Red - Ground
White / Purple - Hot in ACC or Run (Fuse 11)

Speaker Connector:

White / Light Green - (+) Right Instrument Panel & Door Speaker
Dark Green / Orange - (-) Right Instrument Panel & Door Speaker
Brown / Pink - (+) Right Rear Speaker
Pink / Light Brown - (-) Right Rear Speaker
Pink / Light Green - (+) Left Rear Speaker
Tan / Yellow - (-) Left Rear Speaker
Light Brown / White - (+) Left Instrument Panel & Door Speaker
Orange / Light Green - (-) Left Instrument Panel & Door Speaker
Hope this helps.

first inspect ur tires for nails, screws, etc...check ur tire pressure and adjust if necessary. put 32psi , drive it at 30 mph, and the light should go off by itself. if not u may have a tire sensor problem which u will need to take to ur local dealer or tire shop.

it is the low tire pressure indicator, you have low tire pressure in one or more of the tires

Yellow oil can lit means you need to top up the oil. Red oil can means you have lost oil pressure.