My wife's 206 1.4 LX Auto (1999) has developed the following fault over
a long period (three years, but now getting very frequent).  After a few
minutes from cold, and only from cold, when climbing a hill, the Winter
and Sports warning lights flash and gearbox locks into a low gear.
Stopping the car, and switching the ignition off and then restarting
always clears the fault and it won't recur until the car has cooled for
at least 12 hours.  Otherwise the gearbox works like a charm.
unfortunately we live in a deep valley in the mountains...

Ringing the local dealer results in: "we hardly ever see an auto 206,
you'd have to leave it with us and it might well be expensive..." crap.
They didn't even mention reading the ECU.  So, for sure, that dealer
isn't getting to touch it.

Earlier mailings here suggest that this is probably an under-pressure
situation, or the pressure sensors need to be changed.  The fluid level
appears to be correct.  Is changing the sensors a possible DIY task?  Or
can an independent auto transmission specialist do a better job than a
dealer?  Any advice really appreciated.

R.