Fixing the Error Code 165-6596

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This error always occurs on any amiibo compatible game/software (except for Mario Kart 8 if not on the amiibo Mii suits section), due to the NFC board being either disconnected from the GamePad or completely fried. In this tutorial, you will reseat the NFC board back to where it belongs.

Credit: Mod and Pop Thrift (the original video)

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crwdns2931653:01crwdne2931653:0 Removing the stylus and battery lid

Fixing the Error Code 165-6596, Removing the stylus and battery lid: crwdns2935265:01crwdnd2935265:01crwdnd2935265:02crwdne2935265:0

Fixing the Error Code 165-6596, Removing the stylus and battery lid: crwdns2935265:01crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

Remove the stylus. This in order to correctly remove the back cover
Unscrew the battery lid with the P00 Philps Screwdriver.

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crwdns2931653:02crwdne2931653:0 Removing the battery

Fixing the Error Code 165-6596, Removing the battery: crwdns2935265:02crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

After removing the lid, carefully remove the cable connecting the battery to the motherboard and lift up the battery

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crwdns2931653:03crwdne2931653:0 Removing the back cover

Fixing the Error Code 165-6596, Removing the back cover: crwdns2935265:03crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

Remove the screw covers with the pick and use the Tri-wing Screwdriver to unscrew the remaining screws around the GamePad.
Lift up the back cover
Lift up gently, as the rumble motor is attached

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crwdns2931653:04crwdne2931653:0 Reseating the NFC board

Fixing the Error Code 165-6596, Reseating the NFC board: crwdns2935265:04crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

I have put a circle around the correct placement of the NFC board. This is how it should look like.
If the NFC board is detached, gently reseat it back to where it was.
If the NFC board seated correctly, gently remove and gently reseat it.

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To reassemble your device, follow these instructions from Step 3 in reverse order. If the problem persists (even after multiple attempts), it might be time to order a replacement part.