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A look at the OBDII memory / battery saver from Schumacher. This is designed to allow a vechile to retain saved settings during a battery change. For example, this would allow a car to remember radio presents, saved seat positions, saved freeze frame data, engine codes, and emission system checks (saving you a need to repeat a drive cycle for federal emissions testing). This will not work with all vehicles but should work with most. This requires a separate 12v power supply.
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