I have a p0420 on my honda 2003 honda accord gibbs123 in fuquay varina nc on ecm reflash for a 2003 accord for this code sign in to reply. Possible causes and repair information for p0420 honda code learn what does p0420 honda means p0420 honda catalyst system efficiency below threshold bank 1. Hi all my check engine light came on i took it to auto zone they hooked up there computer and the code p0420 came up catalyst system efficiency. Obd ii trouble code p0420 catalyst efficiency below threshold bank 1 honda accord 1998 2002 how to test transmission range switch honda 22l 23l
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