302 is misfire on cylinder 2. Please see my tip at http://www.fixya.com/cars/r6715318-causes_gasoline_engine_misfires .
1684 is battery disconnected, which you caused when you disconnected it--you can ignore that. You probably have an intermittent misfire. Please follow my troubleshooting steps and let me know if you have questions.
Po302 is a cylinder #2 misfire code and if I remember right p1684 is just a code to let you know the battery was disconnect recently and nothing to worry about.
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