Why is 2009 ford fusion abs light staying on occasionally?

ABS light on Ricks Free Auto Repair Advice

First you need to have EBCM - electronic brake control module check for DTC'S - diagnostic trouble code's . If the light is on there is a code stored . I think most part stores can do this and for free . After you find out what code is stored , looking up that code in service repair information for diagnostic trouble shooting chart would be next step . There are a few codes too.
DTC C0035 or C0040
DTC C0045 or C0050
DTC C0110
DTC C0131
DTC C0161
DTC C0186
DTC C0196
DTC C0201
DTC C0240
DTC C0241 or P0856
DTC C0244 or P1689
DTC C0245
DTC C0283
DTC C0287
DTC C0290 or C0292
DTC C0455
DTC C0550
DTC C0558

Find the code do the diagnostic's , fix the problem , wiring issue's , a sensor , bad module ,what ever it is . The light will go out then . Here is a sample of code discription .
• DTC C0035 Left Front Wheel Speed Sensor Circuit
• DTC C0040 Right Front Wheel Speed Sensor Circuit

you have a problem in one of the sensrs have it scan for codes and adress the problem in that particular wheel traction lit should go off once ths abs problem get fixed

there is a malfunction on the abs system. Kindly run a scan on the abs, that will guide you on how to resolve the problem.

Then the system isn't working correctly

My 4WD light flashing and my ABS light stays on what does this mean and what do i need to do. My vechile has about 57,000 miles on and I have never had any issues - is there and recalls or things on this model and make?

It's likeley that a wheel speed sensor is bad, but to really find out it will be necessary to utilize an OBD-II ABS Brake Scan Tool such one made by Actron which covers 1996 through about 2005 year models of most American makes and models.

This tool will tell you in English what is wrong with the ABS brake system, or at least point to symptoms which can lead to a solution.

wait till it goes on again and go to your local pepboys, autobarn autozone rand s etc they usually offer free computer diagnostics, get me the codes, i cn help you then,

You just have to disconnect the battery for 1/2 hour. then reconnect and drive for 10 miles so computer can relearn your engine again. It may run rough. You should have the key off when refueling because computer sensed a fuel vapor leak during fueling and turned the light on.

Also, you can always drive with a check engine light on. It just means you are not meeting emissions. Do not drive if it's flashing on and off.

abs sensor wires are very funny when it comes to just rejoining them as the resistance in the wire is less so abs light may stay on, most earlier fords abs lights will go off after prob is fixed and car is driven, best to go to local garage and get diagnostic done