I do not want to put the blame on the installers but after they installed a kenwood amp with kicker subs, my speedometer doesn't work. I've also noticed that it feels like I'm driving in Neutral. IT doesnt want to drive smoothly. Power steering shows up on the dashboard and my check engine light is on. Could there be a bad wiring or loose wiring somewhere? Could it just be a coincidence that my speedometer died on me? I do not know much about cars but it was fine before the installation of an amp and subs.
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