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OBD II Fault Code

  • OBD II P042A

OBD-II Code Catalytic converter temperature sensor failure is defined as a Catalyst Temperature Sensor Circuit

The Catalytic Converter uses multiple temperature sensors to ensure that the Catalytic Converter is working properly and does not overheat. When the engine control module (PCM) determines there is an incorrect signal from the Catalytic Converter Temperature Sensor, the PCM will set code P042A.

Common Problems That Trigger the P042A Code

  • Catalytic converter temperature sensor failure
  • Powertrain Control Module (PCM) failure
  • Wiring issue
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