hey, my friend got a code 67 in his 97 civic dx, we replaced the header and o2 sencors from another friends car thats known to be a good header/cat/02. and theres still a code 67. we tried to reset the ecu, and we also tried the tin foil trick, none worked. were positive its a code 67, check it numerous times. what other things could cause the code? a bad ecu? thanks

 

first find out what the Code 67 is. If you dont have the manual then search the net.

 

its catalyst system effiency below threshold

 

That code usually indicates a bad cat.

 

It could also indicate a tired secondary O2 sensor