What P0131 means
Diagnostic Trouble Code (DTC) P0131 stands for O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1). This is a generic OBD2 diagnostic trouble code indicating that the engine computer (ECU) has registered an operational anomaly in the powertrain (p) systems.
When this error registers, the ECU records a freeze frame of sensor data and lights up the Check Engine Light on your dashboard to notify the operator of a system fault.
Symptoms of OBD2 Code P0131
When code P0131 is active, your car might exhibit the following common symptoms:
- Check Engine Light on
- Poor engine response and sluggish throttle
- Increased fuel consumption
Common Causes of Code P0131
Faults that trigger this code typically include:
- Cause 1: Faulty Bank 1 Sensor 1 Oxygen Sensor
- Cause 2: Short to ground in the O2 sensor wiring harness
- Cause 3: Exhaust leak upstream of the sensor
- Cause 4: Very lean engine condition (e.g., fuel pump failure)
Can you drive with a P0131 code?
Yes, but the engine will run in open-loop mode, resulting in excessive fuel usage, black tailpipe smoke, and carbon buildup in the catalytic converter.
Expected Repair Cost Band
$100 - $250 for O2 sensor replacement.
Related Diagnostic Trouble Codes
If you have scanned multiple codes, see these related guides for troubleshooting context:
Frequently Asked Questions
It indicates either a failed sensor circuit or a mixture that contains an extreme excess of air (highly lean).