2016 Fit check engine light stays on. Codes say catalytic converter,so had front and back replaced and both O2 sensors replaced. Still running rough and then this morning all dash lights came on. Have had it to the shop numerous times with same codes. Last trip there it would only go 10 mph, never thought it would make it. Any others have this? Also have had new points put on. Injectors maybe?

 

If it's P0420 then most likely it's the injectors and nothing related to oxygen sensors or the catalytic converter.

Spent $2000 more than a year ago with Honda to get these replaced. Was not up to the job myself because it was middle of the winter.

 

Check fuel trims.

If P0420 is present you need live feed of voltage at both sensors. Plenty of videos on how they operate and how to tell if they're bad. No junk O2 sensors either, more problems than not.

Second to this, if the O2 sensors are active and within range but you do have the dreaded "wave" consider if they put the appropriate cat. on. My manifold cat. direct from honda was $1200 and some change - California emissions. I do see often enough people thinking they're smart by getting a cheap - barely passable FEDERAL requirement meeting cat. instead of the California one. Make sure it's right. If you wish to do it yourself I have uploaded a video for the manifold converter - it isn't too bad.
https://m.youtube.com/watch?v=Ir45ihWJTaY&pp=ygUjMjAxNSBob25kYSBmaXQgbWF uaWZvbGQgcmVwbGFjZW1lbnQ%3D

Obviously it's limping for a reason.. Get a good diag., seems your current shop isn't doing it - very simple machines.