Did you try the top-speed on the diagnostic mode on the AC? It is probably more exact than speedo.<br> Press 'Rest' for 5 seconds, then go through the menues by pressing driver side 'auto' until you reach menue 21 (I think). See also topic in W210 forum.<br> <br> I just found out about it so I did not have a chance to check it top-speed according to AC yet, but on my E430T 180km/h speedo is 173 km/h on the AC.
I have also same problem with my e320 1996, overdrive switch(D4) is also not working but there is no problem in upshifting when downshifting from 90-30 km, and then when i m pressing accelerator again it gives a jerk, i hav changed gear oil + gasket + filter again after 15000 km, PAN is very cleaned,(no metal particles)
and had also changed my Mass air sensor before 15000km,
CHANGED MAF+A/T OIL+GASKET+FILTER AT 90,000 KM
CHANGED AGAIN A/T OIL+GASKET+FILTER AFTER THIS PROBLEM AT 1,10,000 KM
CURRENT KILOMETERS ARE 1,10,560 KM
I DID'NT CONFERN WITH ANY MECHANIC YET.
PLZ HELP ME REGARDING THIS PROBLEM, IS MY TRANSMISSION GOING WEAKER,(pan is clean) OR SOME OTHER PROBLEM, ITS HAS 5 SPEED AUTOMATIC TRANSMISSION