P0131 - OXYGEN SENSOR CIRCUIT LOW VOLTAGE (B1 S1)

POST UPDATED IN July, 2020

Description of DTC code P0131 Generic

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 Generic

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 Generic

  • 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 Generic

  • 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.

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