I have a 97 Mercury Sable GS with a 3 L engine that has 110K miles on it.
It's used mostly for short trips around home, but I occasionally drive it
on 200-300 mile trips. Almost every time I do, I get a "Service Engine"
light at about 230-250 miles, but it always goes out after a few days of
normal driving at home. I've taken the car to Auto Zone for help with the
diagnostics, and the code is P1744, "Manufacturer Controled Transmission
That's strange, because there are no apparant transmission problems. The
car shifts smoothly, with no jerks or slipping. The problem has been
fairly consistent for 2-3 years and about 15K miles (tells you how much
it's driven), and I've had the transmission fluid flushed and changed
during that time. I've never been able to get it to a dealer with the
light still on for diagnosis/repair because I travel and the light always
goes out before I get back home.
Does this ring any bells for anyone? I've not been in a hurry to do
anything because the light always goes out and nothing seems wrong, but
now I'm trying to sell the car and can't do so with a clear conscience as
long as this code thing keeps cropping up.