P0421

2017-10-10

Description:

  • The fault code P0421 indicates that the warm-up catalytic converter in bank 1 is not performing efficiently. This may result in increased emissions and reduced engine performance.

Possible Symptoms:

  • Illuminated check engine light

  • Increased emissions

  • Reduced engine performance

  • Decreased fuel efficiency

Possible Causes:

  • Faulty warm

  • up catalytic converter in bank 1

  • Faulty oxygen sensor

  • Exhaust leaks

  • Engine misfire

  • Fuel system issues

  • Faulty engine control module (ECM)

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 warm

  • up catalytic converter in bank 1

  • Replace the faulty oxygen sensor

  • Repair exhaust leaks

  • Address any engine misfire issues

  • Check and repair the fuel system

  • Replace the engine control module (ECM) if necessary

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