I had the service engine soon light on after installing my new head unit. Apparently it is an error code generated by too many battery disconnects. I bought a OBD-2 reader/eraser at autozone, it gave me the code and erased it. You can borrow one from them too if you dont want to buy one. I bought the Actron model for $50, I see newegg sells similar ones for around $25+, I'd recommend getting one for future use, saves time and trips to the dealer.
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