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TuningBot DTC Database · v4.37.15

P0131 O2 Sensor Circuit Low Voltage Bank 1 Sensor 1

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainEmissionsOBD2

What P0131 means

P0131
O2 Sensor Circuit Low Voltage Bank 1 Sensor 1 Generic · emissions Data confidence 90%

The control module detected that the signal in the O2 Sensor circuit stayed below the expected operating range.

Symptoms

  • MIL illuminated
  • Possible increased fuel consumption
  • Possible unstable idle

Possible causes

  • Exhaust leak
  • wiring short to earth
  • H025
  • ECM

Recommended checks

  • Read live sensor voltage/current and heater status
  • Inspect wiring and connectors
  • Check for exhaust leaks near the sensor
  • Check fuel trim values for upstream mixture faults

Related and nearby codes

How to read P0131

P

Powertrain: engine, transmission and driveline systems.

0

Generic SAE-standard code: same meaning on every make.

131

Specific fault index within the subsystem.

Frequently asked questions about P0131

What does P0131 mean?

O2 Sensor Circuit Low Voltage Bank 1 Sensor 1. The control module detected that the signal in the O2 Sensor circuit stayed below the expected operating range.

Is P0131 generic or manufacturer-specific?

P0131 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P0131 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

ECU tuningDyno-tested results by model and engine See the results →

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