Catalyst low efficiency what the expletive does that mean and how do i fix it?

 

it means your cat isn't working right and your secondary o2 sensor is not seeing enough of a difference in readings from what the primary o2 sensor is saying. typically happens if you gut your cat, or replace it with a testpipe. you can get an o2 simulator or CEL fix to override it.

 

its most likely because i have my 2nd o2 sensor taped to the primary wire so since it takes 3 time to trip the code i could just reset my ecu? how much and where can i get an o2 sim and how does it work?

 

google is your friend.