P04F9

2017-10-10

Description:

  • Catalyst Heater Circuit Intermittent Bank 2

Possible Symptoms:

  • Check and potentially replace the oxygen sensor in Bank 2

  • Inspect and repair any wiring issues or loose connections related to the catalyst heater circuit

  • Test and replace the catalyst or catalytic converter in Bank 2 if necessary

  • Verify and fix any issues with the powertrain control module (PCM) or engine control unit (ECU)

  • Perform a thorough inspection and potential repair of the exhaust system in Bank 2

Possible Causes:

  • Faulty oxygen sensor

  • Malfunctioning catalytic converter

  • Damaged or deteriorating wiring or connectors

  • Faulty engine control module (ECM)

  • Exhaust leak

Related Parts:

Possible Solutions:

  • Loss of engine power or sluggish acceleration

  • Engine misfires or stumbles

  • Reduced fuel efficiency

  • Check Engine Light illuminates

  • Strong smell of rotten eggs (sulfur) from the exhaust

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