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Old 04-04-2018, 05:05 AM   #38 (permalink)
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A3 - '12 Audi A3
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Yes and no.

It has a small drain, i leave it in place. But if left for too long it will contribute to battery drain. (My car did not start after 3 months of sitting with dongle attached). It does have a led that is always on i think.
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