Hi, i installed a test pipe a week ago and after a day it threw a CEL. I went last night to get the code and it was (67-1 something catalytic deterioration). I've erased the code, till now there hasn't been any CEL yet. Any idea what is that about??

 

No such code in the Helm manual, but we know what you're talking about.

You can't just get rid of the catalytic converter and expect the ECU to not notice. What brand of test pipe? Did you use either an O2 simulator or the spark plug non-foulers to fool the sensor?

 

67-1 is cat efficiency code the p code for this is P0420. bottom line test pipe.

 

67-1 is the Honda code, P0420 is the SAE DTC. Both the same thing.