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Does anyone know what is reset when you unplug your battery? For example I know the MPG is reset...But do you lose performance because the ECU has been rebooted and needs to be re-programed over time??
 

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HNNLIC
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The ECU is also reset, if the negative cable is off for about 15 minutes. You won't lose performance but probably gain for a limited time since the computer is supposedly learning out you drive.

This also helps to reset a CEL light after the problem has been fixed.
 
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