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Sounds like the headgasket blew. Antifreeze got into oil which is why no antifreeze and appears to have too much oil. Need to have towed to a good engine shop and get estimate.
Probably something rolled under the seat and loosened the harness connection or a wire to it. See other post you had for a way to test. Also, you can pull the connector apart and reconnect while vehicle is off and see if light goes away. Also, see answer #1
If this is an airbag light code, turn vehicle on and wait till idle settles in. Now if the airbag light is still on, move the front seats forward and back a few times. The light may turn off. This means the wire harness under the seat in either loose, has a loose wire or needs cleaned with an electrical parts cleaner.
Have you checked the fuses? Should be located in the cab fuse panel and listed in the owners manual.
May not need repaired or replaced. Get code read and post result on here. May just need a good clean.
Try this out: http://www.ehow.com/how_5764534_change-rear-springs-ford-taurus.html The key is to have the vehicle off the ground on jack stands so when you unbolt the shock mount and lower the jack (slowly), the spring gets overextended and will basically fall out of the 'pockets' it sets in. May have to tap lightly but not usually. Good luck!
Most say 5 years and/or 60,000 miles. Since you have 9 years it would be prudent to change it.
Well, need to check for the a/c line to have enough pressure to 'kick' the compressor on. May just need recharged and they sell the recharge unit at most parts stores.
With a multimeter, touch the black to black and red to red on battery. Note the reading. Now touch black to battery black and red to alternator red wire. If the reading is the same as the battery then they are connected and should be charging. If the reading is 0, you have a fried fusible link or a break in the line from the alternator to the battery. Have a nice Day! :)
$800 Hmmm.....If you think he can do it correctly......jump on that price like flies on sh&t!!!! Most places and shops would charge 200-600 more than that for the same job.