Fault code 67 on 99 civic ECU
Thread Starter
Joined: Mar 2004
Posts: 11
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From: Frederick, MD, USA
Fault code 67 on 99 civic ECU
I bought a greddy 421 header and the CEL came on. It's throwing a fault code 67 which is: Catalyst system Efficiency Below Threshold malfunctioning or defective catalyst system. I wanted to know if anyone could tell me what to do from here.
Honda-Tech Member
Joined: May 2000
Posts: 6,094
Likes: 6
From: PASADENA, CA, USA
Re: Fault code 67 on 99 civic ECU (civicsi21)
normal code for OBD2 vehicles when changing something on your exhaust system. the OBD2 cat code is real sensitive when it detects changes in the exhaust system. Don't worry, it won't hurt your vehicles performance..
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