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Old 12-11-2017, 11:22 PM   #12 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,092

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,307
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I would not throw parts at the problem, if you can avoid it. But yes, you could replace the CAT. But if you have a fueling problsm or an oil burning problem then your replacement CAT coiuld get fouled sooner than otherwise. And the replacements are cheaper when they use less of the precious metals that form the catalyst. You could also go Balto's route of scamming the system. Certainly tempting, but I support the policy goal of the smog testing (which has been successful), even though I do not like CARB's administration of the policy.

I did a detailed write-up on cleaning... Here it is, with citations and videos:

Good luck!
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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