Oops, this is a big mistake, but fortunately not the end of the world.
The 27 mm bolt anchors the B4 transmission band, which is what gives you third gear. If you were to drive the car now, you can't shift into third, but you can skip over it (geartronic) and shift into 4th.
There is a way to use a small screwdriver to try to shift the band back into place to where the threaded part rests right under the bolt hole.
If that fails, then you can drill a small hole in the 27 mm bolt and use a screwdriver through that hole and hold the band in place while you snug the bolt, then seal the hole (tap it and use a small screw, etc.).
If that fails, the trans comes out and has to be disassembled and reassembled.
Read more at the link below and good luck!
2002 XC70 Transmission Nightmare EVERYONE PLEASE READ Page 7
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