i need to know what this is. and what to do. i ran a search but i didn't understand what they were sayin on the post. thanx

 

Its a Bullshit code. Just ignore it. Its the secondary o2 sensor on the cat i believe. If you just changed to high flow cat, that could be the reason. If you're still all stock then i don't know what could be wrong. reset your ecu and see what happens.

 

Catalyst system Efficiency Below Threshold malfunctioning or defective catalyst system

http://www.c-speedracing.com/faq/05.html

 

if i replace the O2 sensor that could fix it right?

 

nope

 

well my car is only a year old. i have about 20k miles on it

 

My car has 8k and i've gotten that code like 20 times. Welcome to the "Code 67 club".

 

so what should i do to fix the problem? i don't wanna get a new cat. could it be because i have a 2.5 in. cat back exhaust?

 

Yeup you answered your own question. The stock OBD2 ecu is very sensitive to any changes in airflow. I don't know if it is your cat or not. I'm thinking it is just the ecu. In that case the only way to fix it is to get an obd 1 ecu. I have also heard of people taking the o2 sensor out, welding the hole in the cat, and wrapping the o2 sensor in foil or something.

 

i have that code as we speak...of course im running a tp tho