What Does Code Po420a Mean?


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kurrapica zoldik Profile
A P0420 code is a trouble code on OBD-II equipped vehicles. All vehicles      from 1996-newer sold in North America support this generic powertrain code. The code's description is Catalyst System Efficiency      Below Threshold (Bank 1). OK, now tell me that again in plain English      please.... Let's break it down: The catalyst system being referred to is your      three-way catalytic converter; so the catalytic converter is not working properly      (i.e. It's not efficient). Bank 1 refers to the side of the engine which contains      cylinder #1. On inline engines such as 4 & 5 cylinder engines, there is      only one bank. So, to really simply things let's just say that the      efficiency of the catalytic converter and/or exhaust pipe and/or O2 sensor      is not so great.

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