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Personally, I wouldn't trust a three year old battery. These cars are very finicky when it comes to power supply, as my friend found out earlier this year in his '02 S. A low battery can cause all sorts of havoc with the ECU, let alone alarms, etc. Upon removal from storage, I would replace the battery, but you will need to drive the car for about a week before all systems are go again (DME ready codes).
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