HI there
This code is for an incorrect gear ratio. Several things can cause this code but the place to start is with the transmission fluid level. You also want to make sure it's clean. There could be an electrical issue causing the incorrect gear ratio, or it could be a mechanical issue with the transmission. Here is some more info
P0730 MERCEDES-BENZ - Incorrect Gear Ratio Read more: https://www.autocodes.com/p0730_mercedes-benz.html
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