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Q: gas gauge temp gauge auto headlights door locks do not work on 2002 Saturn L100

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This problem started about three weeks ago with the car not starting. I unbolted the positive battery cable waited a second and reconnected it. Then the gas gauge and temp gauge would bounce from empty to full or cold to hot. Now they just do not work. The ABS light stays on. The security light stays on as well as the check engine light
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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It is not good to only disconnect your battery positive cable, one should always disconnect the negative cable to prevent any voltage spikes to any of the sensitive electronics on this vehicle. I hope that you did not spike a module, but by the sound of your symptoms, you accidentally may have done so. I would have a good shop inspect this issue at this point:

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