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EmissionsSeverity Medium: diagnose soon

P0544Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1)

What it means

The ECU has detected an electrical fault in the exhaust gas temperature sensor circuit. The ECU uses exhaust temperature to protect the turbo and catalyst and to control DPF regeneration.

Symptoms

  • Check engine light
  • Possibly limp mode or DPF regeneration not running

Common causes

  • Open or shorted wiring between the sensor and the ECU
  • Corroded or loose connector
  • Failed exhaust gas temperature sensor

What to check first

  1. Compare the live reading with the real temperature (IR thermometer)
  2. Measure the sensor resistance and compare it with the temperature table
  3. Check the 5 V pull-up and the ground at the connector
Can I drive with P0544? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P0544: questions and answers

What does P0544 mean?

P0544: Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1). The ECU has detected an electrical fault in the exhaust gas temperature sensor circuit. The ECU uses exhaust temperature to protect the turbo and catalyst and to control DPF regeneration.

What are the symptoms of P0544?

Check engine light. Possibly limp mode or DPF regeneration not running.

What causes P0544?

Open or shorted wiring between the sensor and the ECU. Corroded or loose connector. Failed exhaust gas temperature sensor.

How do you diagnose P0544?

1. Compare the live reading with the real temperature (IR thermometer) 2. Measure the sensor resistance and compare it with the temperature table 3. Check the 5 V pull-up and the ground at the connector

Can I drive with P0544?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.