My car doesn't have reverse but will go on D, 2 & 1. What's the problem? HELP!!!

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I would also need to warm up my car for like 30 min. to an hour in order for it to actually move. Now my overdrive light is blinking continuously even when I push the button on the shifter and my check engine light stays on. Please, I need to know what's wrong koz it's the only transportation I have. Any help is greatly appreciated. Thank you!