Iv just got a Citroen c4 2008 4 days ago it stoped dead come up depollan fault engine management light came on now it's saying the crankshaft sensor

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It doesn't say anything it just gives a fault code for a circuit or system. You can have a sensor issue or a wiring issue or the computer can be faulty. You use a scanner to watch the signal from the crankshaft sensor to determine if any signal is being generated.
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