P04F8

2017-10-10

Description:

  • Catalyst Heater Circuit Intermittent Bank 1

Possible Symptoms:

  • Check and replace the oxygen sensor in Bank 1.

  • Inspect and repair any damaged wiring or connectors in the catalyst heater circuit.

  • Clean or replace the catalytic converter in Bank 1.

  • Verify the operation of the engine control module (ECM) and perform any necessary reprogramming or updates.

  • If all else fails, consider replacing the ECM itself.

Possible Causes:

  • Faulty oxygen sensor

  • Malfunctioning catalytic converter

  • Wiring issues in the catalyst heater circuit

  • Faulty engine control module (ECM)

  • Exhaust leak in the catalytic converter area

Related Parts:

Possible Solutions:

  • Check engine light illuminates on the dashboard

  • Reduced engine performance or power

  • Increased fuel consumption

  • Failure to pass emissions test

  • Delayed or rough engine start

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