you have pushed the O/D lockout button on the shifter. It is the smaller button just below the big button on the shift lever handle. The O/D light indicates that high gear in the transmission is no longer available. Use it only for towing or if you are like me, to give engine braking on steep hills. Sometimes I use it in town to prevent excessive shifting in and out of Top Gear. Engine will rev higher and use more fuel, so it's best to leave it off.
what need to do when indicator light is on
We need to know which indicator light you speak of.
Your transmission sensor might be broken
The "part-time" indicator light illuminates when the vehicle's transmission is positioned into the 4 wheel drive status. Once the vehicle is returned to 2 wheel drive the front hub locks disengage and the indicator light goes out.
It means you have pressed the power/normal button near the shifter,when the power light is activated the truck will hold the gears longer at a higher RPM before shifting ,good for towing.
The GED indicator light is an warning indicator. Essentially, it means that the alternator in the vehicle is not charging properly.
4x4 indicator light
It means that the car is turning whatever side the indicator light is on. This is the same with every car
On a Mazda tribute, the car with a key light indicator means that the engine is started.
Airbag. Off light
A malfunction.
It is the powertrain/4x4/AWD malfunction indicator. It is the second indicator light covered in your owners manual if you have one.