P0151 - O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 2 SENSOR 1)

Diagnostic code P0151 refers to the first Oxygen Sensor (O2) located on bench 2, at the front of the catalytic converter. This oxygen sensor measures the amount of oxygen that is expelled by the exhaust. It plays a fundamental role in the control circuit, which constantly verifies that the air-fuel mixture is correct. It sends a signal which is used to handle closed-loop fuel delivery.

The meaning of this basic form code is that the voltage of the O2 (Oxygen Sensor) has remained low for more than 2 minutes. This is understood by the Engine Control Module (ECM) as a low voltage condition, and therefore establishes fault code P0151 OBD2.

• Check Engine light's on.
• Fuel consumption is higher than normal.
• Excessive smoke expelled by the exhaust.

A P0151 establishment may mean that one or more of the following problems have occurred:

• It is possible that the resistance in the Oxygen Sensor (O2) signal circuit is high.
• There may be a short circuit at voltage in the Oxygen Sensor (O2) signal circuit.
• O2 may be defective.

To solve the code P0151 OBDII you can do the following:

• Repairs a short circuit, an open line or a high resistance Oxygen Sensor (O2) circuit.
• Replace the Oxygen Sensor (O2).