What does code P043A mean?

Q: What does code P043A mean?

Catalyst Temperature Sensor Circuit Bank 2 Sensor 2. P043A means the powertrain control module (PCM) has detected an abnormal electrical condition in the catalyst temperature sensor circuit for bank 2 sensor 2, which monitors the rear catalyst on the bank opposite cylinder one. The PCM compares the sensor signal voltage to expected limits and flags the circuit when the reading stays out of range for a calibrated time, indicating an open, short, or excessive resistance in the sensor or its wiring.

DTC codes / P04xx · Auxiliary emission controls / P043A

P043ACatalyst Temperature Sensor Circuit Bank 2 Sensor 2

P043A means the powertrain control module (PCM) has detected an abnormal electrical condition in the catalyst temperature sensor circuit for bank 2 sensor 2, which monitors the rear catalyst on the bank opposite cylinder one. The PCM compares the sensor signal voltage to expected limits and flags the circuit when the reading stays out of range for a calibrated time, indicating an open, short, or excessive resistance in the sensor or its wiring.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.