Description of DTC code P0131

The P0131 diagnostic code indicates that the voltage remained low for more than 2 minutes. The PCM (Powertrain Control Module) interprets this voltage as a low voltage condition, and that is where the check engine light activates on your board.

Note: This Sensor (02 Oxygen Lambda Sensor) is located near the Catalytic Converter.

Symptoms of fault code P0131

Generally for code P0131 there are no visible symptoms, except for the following:

  • The Check Engine Service light is on.
  • It can have a high fuel consumption.
  • Excessive smoke from the exhaust pipe.

Causes of OBD2 P0131

  • One of the main causes of this DTC code P0131 is that the Oxygen Sensor (O2 LAMBDA) is defective.
  • The Oxygen Sensor Circuit (O2 LAMBDA) may be shorted.
  • The circuit may be open at the Oxygen Sensor signal (O2).

Possible solutions of the DTC code P0131

  • Clean the Oxygen Sensor (O2).
  • Mount the sensor on a PCM test bench and verify that the signal in volts is correct.
  • If the Oxygen Sensor (O2) circuit is short or open, repair it.
  • Verify by reading the data line / live with an advanced automotive scanner and note the readings in volts, both for vehicle in brand, and in idle.
  • Replace the Oxygen Sensor (02) defective.

Note: The normal ratio of this sensor should indicate 14/7 parts of air per 1 stoichiometric fuel.

Remember that this sensor is very important for the protection of the environment under SAE standards that regulate the automotive market worldwide.

Codes related to P0131

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