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I have a 04 mercedes benz c240 with the code p0715 and i already changed the valve body with the conductor plate 2 times and difrent sensors and still it shifts hard when i put it into drive and when test driving it it doesnt come out of first gear please help im very frustrated with this car got not much info on it coustomer was driving it from a auction fine and all of the sudden when they stopped in the store and back again it did not shift no more help please thanks