My daughter's 2001 Civic LX had the Check Engine light come on. The
error code was P0740, which is apparently a torque converter clutch
malfunction. I assume that has something to do with the lockup
function. Honda service in Tampa said it would be a transmission
replacement but recommended she keep driving it until it quit - which
may be soon or forever.

I've seen posts in several forums saying to have the transmission
flushed but further posts that it really doesn't resolve the problem.
Any suggestions? If it's just that the lockup may or may not work, I
don't see that doing any damage for around-town driving. I'm inclined
to tell her to keep driving it until other problems develop.

The car is a 2001 Civic LX with 125k on it. She's put about 25k on
herself. Car is otherwise in good shape. Belt changed about 10k ago.
New tires, etc. So the car seems to be worth keeping.