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.