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EmissionsSeverity Medium: diagnose soon

P2031Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 2)

What it means

The ECU has detected an electrical fault in the exhaust gas temperature sensor 2 circuit. This sensor is usually before the particulate filter and controls regeneration.

Symptoms

  • Check engine light
  • DPF regeneration may not run
  • Possibly limp mode

Common causes

  • Open or shorted wiring between the sensor and the ECU
  • Corroded or loose connector
  • Failed exhaust gas temperature sensor 2

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 P2031? 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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P2031: questions and answers

What does P2031 mean?

P2031: Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 2). The ECU has detected an electrical fault in the exhaust gas temperature sensor 2 circuit. This sensor is usually before the particulate filter and controls regeneration.

What are the symptoms of P2031?

Check engine light. DPF regeneration may not run. Possibly limp mode.

What causes P2031?

Open or shorted wiring between the sensor and the ECU. Corroded or loose connector. Failed exhaust gas temperature sensor 2.

How do you diagnose P2031?

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 P2031?

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