P0031

2017-10-10

Description:

  • The fault code P0031 indicates that bank 1, sensor 1 oxygen sensor (HO2S) has a low voltage signal to the heater circuit.

Possible Symptoms:

  • Illuminated check engine light

  • Poor fuel economy

  • Rough idle

  • Failed emissions test

Possible Causes:

  • Failed oxygen sensor

  • Damaged wiring or connections in the circuit

  • Failed powertrain control module (PCM)

Related Parts:

  • Heated Oxygen Sensor: This is one of the parts that fails very commonly. It measures the amount of oxygen to ensure proper combustion. Problems in the Oxygen Sensor lead to poor fuel economy

Possible Solutions:

  • Replace the oxygen sensor

  • Check and repair any damaged wiring or connections

  • Replace the powertrain control module (PCM) if necessary

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