P0423

2017-10-10

Description:

  • The fault code P0423 indicates that the efficiency of the heated catalyst is below the threshold for Bank 1.

Possible Symptoms:

  • Illuminated check engine light

  • Failed emissions testing

  • Reduced engine power or acceleration

  • Rattling noise coming from the catalytic converter

Possible Causes:

  • Failed catalytic converter

  • Engine misfire or running too rich

  • Faulty oxygen sensor(s)

  • Exhaust leaks before or after the catalytic converter

Related Parts:

  • Catalytic Converter: A catalytic converter is a device that converts toxic gases and pollutants to less harmful pollutants. Problems lead to harmful emissions out of limit, rotten egg smell from exhaust & reduced speed

Possible Solutions:

  • Replace the catalytic converter

  • Fix any underlying engine issues causing the catalyst system to fail

  • Replace faulty oxygen sensor(s)

  • Repair any exhaust leaks before or after the catalytic converter

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