Ask your mechanic to replace the so called "Range Recognition Switch", it's in the shifter unit, cost about $100 and an hour or so to replace. Reading the ECU and TCU won't show, unless you connect the StarDiag to it, and manually shifting between difference gear and read back the RangeReg switch.
Until you fix it, while you're driving, if car stuck in first gear, jiggle the shifter the unit a bit (but not to shift it back to nertral and back) will fix the problem
Very common problem on the pre 2000 mercedes
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Originally Posted by rons
It is temperamental... sometimes it shifts normally and then other it just stays in a low gear...won't upshift. If I stop and go thru the gears it sometimes will work and at other times while it seems to be shifting normailly it will downshift suddenly and gear the car down when I am going at a higher speed.. I just tooki it to a transmission specialist and he is stumped.. any help here is appreciated..
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