While tighting a torx T40 bolt the torx head of wrench broke inside the torx head of the bolt. Do you have any advise how could I take it out?

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pat201

And here is how a bolt should look like

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pat201

I would try tapping on it in the direction opposite the direction you were turning it when it broke then put a magnet on it to see if it will come out.

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Jim

You might try a slot head screwdriver that's just the right fit.

Sixto
91 300SE
86 300SDL (due soon)
81 300SD (for sale cheap)

You could JBweld an old bolt to it and leave it overnight. It should come out.

In the worst case, you could mig weld something to it and pull it out (if you have access to a small mig welder).

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D.H.

04 ML500
02 E430

Experience is something you don't get until just after you need it.

I would:

1) drill a hole in the center of the broken Torx bit

2) drive a wood screw in the hole

3) add some WD40 or loosenut

3) pull the screw out

my 2 cents

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Reno

'93 300E 4Matic
'98 Nissan Altima
'00 Yamaha Road Star Silverado

I have been there, done that and renok7's idea worked for me many times.