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Forum: Honda Accord (1990 - 2002)
07-15-2011, 10:29 AM
Replies: 48
Views: 472,188
Posted By cdkm27

Icon2 Re: P0420 Catalyst system efficiency below threshold (bank1) o2 or cat?

I just had a smog check, and I have this same error, in addition to the 02 sensor. Does anyone know if I can use an aftermarket cat converter on a 2003 hatchback civic si?
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