What does code P0131 mean?

A code P0131 may mean that one or more of the following has happened: Faulty o2 oxygen sensor in BANK One (1) sensor One (1)....Short to voltage on O2 signal circuit.....High resistance or open on O2 signal circuit ........Possible Solutions...... Replace faulty sensor Repair short, open, or high resistance on o2 signal circuit

Oxygen Sensor Circuit Low Voltage (Bank 1, Sensor 1 and Bank 2, Sensor 1)

The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.