Cigar lighter / power outlet fuse in the Audi A3 / S3 is the fuse №F40 in the Instrument panel.
Fuse box location
Passenger compartment
Left-hand drive vehicles: located behind a cover near the steering column.
Right-hand drive vehicles: located behind a cover in the glove box.
Engine compartment
It is located in the engine compartment (left-side)
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