code P0420 means that the PCM does not see the proper change in exhaust gas after the primary CAT, this could be a clogged CAT or your secondary O2 (the one after the primary CAT) is bad.
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02-15-2010
code P0420 means that the PCM does not see the proper change in exhaust gas after the primary CAT, this could be a clogged CAT or your secondary O2 (the one after the primary CAT) is bad.
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