P0420 Honda -

Question

ok my problem is this p0420 code came on I changed the cat conv and the 2 oxygen sensor now its coming on stating p0420 and I look to see whats incomplete and its saying evaporation system mon inc

Answer 1

Hi there,

This code indicates an issue with the catalyst system. Here is a list of possible causes.

P0420 HONDA - Catalyst System Efficiency Below Threshold Bank 1

Read more: https://www.autocodes.com/p0420_honda.html