I have the same problem, let me know if you figure it out.
http://www.focusfanatics.com/forum/showthread.php?t=130821

 

http://www.focusfanatics.com/forum/showthread.php?t=167830&highlight=p0750

has the how to very easy to replace

 

My problem has a bit different symptoms. Mine don't toss on the light.
http://www.focusfanatics.com/forum/showthread.php?t=176193


Your Light and Malfunction A.
5/16 socket 1/4"drive and a 2"extension. Is all you need.
An oil catch pan/Filter and 4 quarts of oil. and some rags.

Pull pan. 20 screws. SPLASH
Unplug temp sensor from filter. Plug sensor in new filter. (just pulls out)
Pull Down filter. Has oring squeeze is all. She comes out with a tug.
Unplug "a"
5/16 on solenoid.
Tug on solenoid. She slides out.
Oil up orings on new solenoid and pop back in.
Plug wire back in.
install filter
reinstall pan with gasket that came with filter.
Torque bolts to 60-70 inch pounds.
Dump in 3 quarts.
Check and add if necessary.


Shift solenoid A: P/N XS4Z-7H148-AA $45.77 same as “A,B” Just bought one two days ago.

Dan

 

My problem has a bit different symptoms. Mine don't toss on the light.
2002 Auto Transmission


Your Light and Malfunction A.
5/16 socket 1/4"drive and a 2"extension. Is all you need.
An oil catch pan/Filter and 4 quarts of oil. and some rags.

Pull pan. 20 screws. SPLASH
Unplug temp sensor from filter. Plug sensor in new filter. (just pulls out)
Pull Down filter. Has oring squeeze is all. She comes out with a tug.
Unplug "a"
5/16 on solenoid.
Tug on solenoid. She slides out.
Oil up orings on new solenoid and pop back in.
Plug wire back in.
install filter
reinstall pan with gasket that came with filter.
Torque bolts to 60-70 inch pounds.
Dump in 3 quarts.
Check and add if necessary.


Shift solenoid A: P/N XS4Z-7H148-AA $45.77 same as “A,B” Just bought one two days ago.

Dan

Thank god, someone got the diagram, i have the same problem but a little different, my solenoid A been acting up, and i replace it with a second hand, and put everything together close fluid pan and pour transmission oil in it again, and test it up with the scanner on hand, it keeps giving me the P0750 code. The next day i remove everything again and put the Shift Solenoid B at A and put another second hand at B. It start and run realy good, after 2 days and a halve, the same problem again. I went to a transmission shop, they told me to inspect all my wires, and i said ok will do. I went home and did just that, and i came across a broken wire, the Shift Solenoid D have a broken wire and it was real close to the valve body, my guess is it was touching the valve body and creating some sort of signal/electric problem. So i bought a new solenoid A and replace it. So far my car runs fine and its been only 24 hour.

 

you mean trans fluid right no oil?

 

he may have gotten this fixed already. it was about a year ago

 

i kno well im going through the same problem and doubt hes an active member anymore so i thought id go through a couple posts and place the how to i found
i donno bored and frustrted i guess

 

Dandcool tyvm for the informative diagram made things insanely easy lost O.D and thought trans would be done Thanks was solenoid A works fine after replacing it, so far drove 20m ill see how it is in a week and then celebrate hehe.

 

Solenoid A

Thank you to everyone for the great information. My OBD reader was saying Solenoid A. Followed the other posters instructions and have no problems again. Most of the shops wanted 2 hours labour. I did it in about 2 hours myself. My 02 Focus has 261k kms. Still going strong. Also did the Thermostat Housing recently.

 

Old thread or not it just saved me a lot of money

 

I agree with "Davelavallee"......."Old thread or not it just saved me a lot of money". Was driving my '03 when the trans acted like it went into neutral and then engaged again. MIL came on and I thought...."It's the kiss of death, $2000+ trans overhaul here it comes"! Bought a OBD2 scanner and it gave me a P0750 code which ended up being the shift solenoid "A". Went to Ford dealer and bought it (lucky they had it in stock). Dropped the pan, replaced the solenoid and buttoned it back up and it's been running great ever since. Best thing I every did was to buy that scanner....and like "Davelavallee" said it saved me big bucks!

 

I have a similar issue with my 02 Focus Se Wagon. Can anyone assist to get a shop to sell the solenoid A to me and also steps to take to fix it. Is there anything like Clutch in an automatic transmission system?

 

shift solenoid "A"

I recently purchased a automatic 2002 ford focus and was told it had transmission issues. but when i drove the vehicle it would slip like it wasnt going into gear, but it would be random... First, second, third, and fourth. but i found out if i manually put the vehicle in first, or second it drove fine.. at that point i realized it cant be the transmission if it slips only in drive. so i shut off overdrive and it works fine now.