CEL P0420 code (67)
01-07-2004, 10:32 PM
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CEL P0420 code (67)
I am throwing code 67 (catalyst system efficiency below threshold). Normally this would throw when your cat gets backed up, but I have a test pipe why is it throwing this code?
01-08-2004, 09:05 PM
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Re: CEL P0420 code (B16AHondaSi)
It also throws it when you have a testpipe on OBD2 + cars. It has to do with the second O2 sensor having the same reading as the first. You can get an O2 simulator or just ignore the cel, which I did for 2 1/2 year before going with hondata.
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