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EmissionsSeverity Medium: diagnose soon

P0546Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 1)

What it means

The exhaust gas temperature sensor signal voltage is too high. For this type of sensor that means the ECU sees an impossibly low temperature (about −40 °C), usually because the circuit is open. 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 signal or ground wire
  • Unplugged or corroded connector
  • Open circuit inside the sensor

What to check first

  1. Live data shows about −40 °C
  2. Bridge the connector terminals with a jumper: the reading should jump to a very high value
  3. Measure the sensor resistance (OL means it is open)
Can I drive with P0546? 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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P0546: questions and answers

What does P0546 mean?

P0546: Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 1). The exhaust gas temperature sensor signal voltage is too high. For this type of sensor that means the ECU sees an impossibly low temperature (about −40 °C), usually because the circuit is open. The ECU uses exhaust temperature to protect the turbo and catalyst and to control DPF regeneration.

What are the symptoms of P0546?

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

What causes P0546?

Open signal or ground wire. Unplugged or corroded connector. Open circuit inside the sensor.

How do you diagnose P0546?

1. Live data shows about −40 °C 2. Bridge the connector terminals with a jumper: the reading should jump to a very high value 3. Measure the sensor resistance (OL means it is open)

Can I drive with P0546?

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