[Frugalspender]

I got a code for low octane on my 2011 F8, did some research and figured it was more then likely ready to replace or re torque the knock sensor. So I went to take the sensor off, and it came off with barely any strength. Come to find the sensor was hanging on by a thread, and the head of the bolt came right off. I’ve been trying to get the bolt out and I feel like I’ve tried everything.
Any chance someone has any ideas on how to get this out?

 

[sudden_impulse]

Left handed drill bit might work, if it's not corroded you could use a bolt extractor if the drill bit doesn't work.

 

[Frugalspender]

Left handed drill bit might work, if it's not corroded you could use a bolt extractor if the drill bit doesn't work.

Left handed bit is my next shot. The engine is on a big slant, so it’ll be difficult to get it in there. Will have to use a 90° bit to have any shot

 

[Silver93t]

90 degree drill and a reverse bit. Don't drill through the head.

 

[tiggershark]

Option 2 Try ebay for a used cylinder head. They might be affordable.