Most expensive repair?

[Grumpy Goat]

After the accident, probably my fork oil service. That was about $339. I do all my own maintenance so costs are kept low.

The accident was about $7500 but insurance paid that.

O2 sensor was the problem with your bike, eh? How old is your bike and how many km? Ever consider investing in a GS-911? With that you can at least read what the codes are, and with a Haynes manual you may be able to do a fair number of repairs yourself, depending on your situation.