I ran a hardware test, holding D under boot on my MacBook Air mid 2012. It gave me one error and I can't seem to find out whats wrong by searching google. Do anyone here know what this message means? 

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That is a battery error code. What does it say on the battery icon in the upper right menubar.

Hold the option Key and click the icon for the battery condition.

It may be that your battery is fine. Some aftermarket batteries will give out error codes. 
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