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  • p0420 OBD Ii Scan results on 2002 Honda Civic EX?

    You are here: Home » FQA » p0420 OBD Ii Scan results on 2002 Honda Civic EX?

    Took my car to the shop and it came back with the code p0420: Although on the readiness results it says my Catalyst is fine along with the two sensors all saying “Ready”, although its says my Heated Catalyst is “Unsupported” and my EVAP says “NOT READY”. Any idea what the problem could be?

    In a Honda, it is usually a bad catalytic converter or oxygen sensor. The car is 9-10 years old, so you do not qualify for a free emission parts replacement.

    I replaced both the O2 sensors first and the codes stayed on and then the cat converter today and I think the code went away after I replaced the Cat converter. Universal welded fit is cheaper.

    Catalytic Converter on a 2003 EX.

    P0420 Honda Civic 2001

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