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Since you need to have the car in accessory to scan, it only takes about 20 to 30 minutes to really run down your battery.

For this reason, the VW literature says to connect a small battery charger while running scans. From personal experience, it is necessary. You might get by with one quick scan without a charger, but that would be all.

Connect a charger under the hood and scan all you want.

Don't connect a charger, you you will end up getting tons of low voltage errors. I speak from experience.
 
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