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Car will not start.. Battery is working. checked both sets of keys nothing. on 2006 BMW 330i

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The night before gave someone a jump, I am unsure if that had anything to do with it.. On a tight budget
(2) Answers
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In the future it would be advised to avoid jump starting other cars. There is a small control module, the Intelligent Battery Sensor (IBS), that is part of the negative battery cable. It will have two small pigtails that come off the module. Try disconnecting those pigtails and see if the vehicle cranks. If it does, the negative battery cable/IBS is most likely defective. To properly verify the problem would require a factory scan tool.
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