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Mercedes-Benz 230 1990: Won't accelerate beyond 70 km/h

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My 1990 Mercedes-Benz 230 does not want to accelerate beyond 70 km/h. What is wrong?

It's probably in limp-home mode, which means the car's computer has detected something amiss and will only allow the car to run to get you home or to a mechanic. Have a mechanic do a diagnostic check on it, which should show up the cause of the problem.

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