Error P0150 – how to fix?

Code definition P0150

O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)

What does the code P0150 mean

P0150 is a generic OBD-II code which indicates that the O2 sensor 1 in bank 2 does not meet the minimum or maximum voltage limits calibrated on the Engine Control Module (ECM).

What causes the code P0150?

• The ECM monitors the O2 sensor high and low voltages. For P0150, the voltages from the O2 sensor are out of specification.
• The ECM detects a voltage problem and turns on the Check Engine light.
• Exhaust gas leaks in front of the sensor cause erratic sensor readings.

What are the symptoms of the P0150 code?

• The engine may run on too rich fuel if the engine is kept in open circuit.
• If the spark plugs become dirty over time, the engine may stop working.
• The Check Engine light will come on.
• There may be flue gas leaks at the manifold or header connection.

How does the mechanic diagnose the code P0150?

• Scan the codes and document the data from the frozen frame, then erase the codes to verify the fault.
• Monitor the O2 sensor data to see if the voltage changes between 0.2 V and 1.2 V and replace the sensor if it is out of specification.
• Check the O2 sensor wiring and harness connections for corrosion. Repair or replace faulty connections
• Check for exhaust gas leaks upstream of the sensor and repair any leaks that may affect the sensor.
• For further diagnostics, spot tests recommended by the manufacturer should be performed.

Common Errors Diagnosing P0150?

• Follow these simple tips to avoid mistakes:
• Repair exhaust leaks upstream of the sensor to avoid inaccurate readings.
• The O2 sensor may receive contamination from the oil or coolant and should be repaired before replacing the O2 sensor.
• Damaged harnesses must be properly repaired – no shortcuts – to avoid a faulty circuit.

How serious is the P0150 code?

• A leak in the exhaust manifold may cause the O2 sensor to think that there is too much oxygen in the exhaust gas and the ECM will enrich the mixture to compensate for this, thus using excess fuel.
• The O2 sensor may not be reading properly if exhaust gas is leaking upstream of the sensor.
• The ECM can remain in open loop until the O2 system is repaired or the O2 sensor is restarted, causing abundant long-term conditions that can damage other engine components.

What repairs can fix the code P0150?

1. Replace the O2 sensor in bank 2 of sensor 1.
2. Repair or replace the wiring or O2 sensor connection in bank 2 of sensor 1.
3. Repair exhaust gas leaks at the manifold for bank 2

Additional considerations for P0150 code considerations

The O2 sensor circuit for sensor bank 2 of sensor 1 is used to provide voltage feedback to the ECM to control the fuel to air ratio for engine bank 2.