My wife has a 2000 C280 with 216,000 miles on it. We had the codes read for other issues and it showed impermissible ratio, although it doesn't seem like it has mechanical issues (no slipping). Is this just showing it's age and still has a bunch of life left or is it the beginning of the end? The car needs money for the other things and I was wondering if I should spend the money fixing them or sell it. Replacing the transmission would not be worth it. Generally speaking, what's the life expectancy of them? I'm used to standard transmissions, not much experience with slush boxes.

Thanks

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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)