I kinda broke this last night....is it easy to replace? Expensive?

 

Very simple replacement. I broke mine when I was changing out my motor mounts shifting the engine back towards the firewall. Total cost was about $10 and that included the special tool which is nothing but a long deep well socket to take off the old sensor and put the new one on.

 

I tried gluing it but not sure if it will hold.

 

Just get a new one for $10. It's not hard to get to. I can get to it and I have fat arms.