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There are a lot of reasons why your car won’t start:
Faulty starter motor,Low voltage/Bad car battery,Bad fuel pump,Faulty,crankshaft sensor,Faulty ignition coil,Faulty ignition switch,Faulty ignition relay/main relay.
The first thing you should check is whether the engine is cranking or not. If you know that your engine is cranking, you can go to the next step. in this video i m show you a smart key car not cranking and how to step by step diagnosis the problem .