this code started to show up after i got my exhaust. could my exhaust be too big? it is 2.5in. how can i fix this problem?? i think i'm gonna end up trying to get an ITR cat back. would that fix it? please give me some advice.

 

anybody??

 

What does code 67 mean?

 

Code 67: Catalyst system Efficiency Below Threshold malfunctioning or defective catalyst system. What kind of converter are you using?

 

i'm running a stock cat

 

That code usually indicates a worn out cat.

 

well then thing is, the cel came on the day after i got the exhaust. is it possible that my O2 sensor on the cat may be messed up or broken?

 

Yes.