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What is the possible cost to fix the po740 code on a 2005 Mazda rx8?

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The car runs fine and can't seem to find any other issues.. Just the code

Vehicle: 2005 Mazda rx8

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P0740 Torque convertor clutch ( TCC ) System malfunction

Depends on where the TCC problem is. If it is due to hydraulic problem change the transmission fluid and a transmission additive.

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