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Q: Sensing and diagnostic module

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Keeps drawing power through the 10 amp fuse 4.9 volts when keys off.

My car has 110000 miles.
My car has an automatic transmission.

If you are referring to the fuse that allows your OBD2 connector to be powered up, this would be a normal function of your vehicle. 4.9 volts sounds about right for something like that as well. The OBD2 connector is connected to the powertrain control module and will always receive battery power as a normal function of your automobile.

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