The answer is on page 11 in the owner's manual ( "Light is blinking" ). Engine is misfiring, bring it to a garage as soon as possible.
Leaking coolant, making noise or engine overheating.
AutoZone will check your computer codes for FREE.
You need a code reader, so you can find out what is making this engine light come on. This way you will fix problem. You can also clear codes, turn engine lights off with it. It a great investment.
It allows the car to operate at lower revs making for a smoother drive and better fuel consumption at higher speeds. The gearbox will shift into overdrive itself, so it is always best to have it switched on in normal driving conditions. You only need to switch off the overdrive when you need greater engine braking or are towing a heavy load.
The first model year of the Ford F-150 with the 5.4 liter 3V engine was the ( 2004 model ) and then in the Ford Expedition in the ( 2005 model )
Same reason as the first expedition, and other similar expeditions: in the expectation of making money.
"OD" light indicates whether or not you are allowing the transmission to shift into "Overdrive" I believe with the light "on" you are preventing the upshift into overdrive (therefore using more fuel and making the engine work harder than necessary). Light "off" allows transmission to shift through all gears as predetermined by factory.
When approaching a blinking yellow arrow traffic light, a driver should proceed with caution and yield to oncoming traffic before making a left turn.
Bad bearing?
battery is dead
you need to replace the vehicle speed sensor that should take care of bothe the speedodmeter and the blinking S3 light