Posts Tagged: P0131

P0131: What it means and how to fix it

Learn what a P0131 code means and how to fix it A P0131 code is defined as: “Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 1).” This sensor is located on the engine bank that houses the #1 cylinder and is located BEFORE the catalytic converter The PCM sends a reference voltage (usually 5-volts) to the variable resistor in the oxygen sensor and looks for a return voltage. Once the sensor is heated up, the PCM expects to see a varying voltage. If the PCM sees a constantly low voltage, … Read More