P04F4

2017-10-10

Description:

  • Catalyst Heater Circuit Low Bank 1

Possible Symptoms:

  • Check and repair any wiring or connection issues related to the catalyst heater circuit in bank 1.

  • Inspect and replace the catalyst heater relay if it is faulty.

  • Test and replace the catalyst heater temperature sensor if it is malfunctioning.

  • Clean or replace the catalytic converter if it is damaged or clogged.

Possible Causes:

  • Faulty catalytic converter

  • Malfunctioning oxygen sensor

  • Issues with the engine control module (ECM)

  • Wiring or connection problems in the catalyst heater circuit

  • Exhaust leak near the catalytic converter

Related Parts:

Possible Solutions:

  • Check engine light stays on

  • Decreased engine performance or power

  • Increased fuel consumption

  • Failed emissions test

  • Lack of heat from the vehicle's heater

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