my check engine light keeps coming on and its giving code 67 which is "Catalyst System – Efficiency below threshold. Malfunctioning, missing, or defective catalyst system". how can i fix this? the car runs like **** when the light is on. thank you.

 

Hmm I am guessing your catalytic converter is shot.. but with it running bad maybe an O2 sensor... I would go to the dealer and have them run a diagnostics on it and let you know..

 

thank you. i just replaced the o2 sensors. i guess i'll just get my high flow cat and 3" exhaust now.

 

YEah thats the best way to do it!!!

 

if its broken, upgrade it

 

how much u pay for taht o2

 

too much octane booster, or race gas, will also burn up the cat, or if the gas has lead in it.....mine burnt up once, got it replaced under warranty though

 

what year teg do you have....i have the same problem. when i got my exhaust in may it started thowing me the code 67. what kind of o2 sensors did you get and how much were they. did you <U>have to</U> replace both of them? did the light come back on after you reset the ecu?

 

its a 2000 gsr with turbo. i replaced the sensors with stock ones. the primary sensor cost me $200 and the secondary was $160. i replaced the primary sensor about a month ago because i was getting code 1. then last week i started getting code 67, i was told it was the secondary sensor, so i replaced that on saturday. while driving my car on sunday nite and this morning the stupid check engine light came back on, again code 67. so now i have to replace the cat. if its not one thing its another.