Error P0150 – how to fix it?

Definition of the P0150 code

O2 sensor circuit failure (bank 2 sensor 1)

What does the code P0150 mean?

P0150 is a generic OBD-II code that indicates that the O2 1 sensor in bank 2 does not meet the minimum or maximum voltage limits calibrated in the engine control module (ECM).

What causes the P0150 code?

• The ECM monitors the highest and lowest voltages from the O2 sensor. In the case of a P0150 code, the voltages coming from the O2 sensor are out of specification.
• The ECM detects a voltage problem and turns on the Check Engine light.
• Exhaust leaks upstream 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 open circuit.
• If the spark plugs become dirty over time, the engine may start to stop running.
• The Check Engine light will come on.
• There may be exhaust leaks at the manifold connection or manifold piping.

How does a mechanic diagnose a P0150 code?

• Scan the codes and document the freeze frame data, then erase the codes to verify the fault.
• Monitor O2 sensor data to see if the voltage varies between 0.2 V and 1.2 V, and replace the sensor if it is out of specification.
• Check the O2 sensor and harness connections for corrosion. Repair or replace defective connections
• Check for exhaust leaks upstream of the sensor and repair any leaks that may affect the sensor.
• For additional diagnostics, perform point-of-care tests recommended by the manufacturer.

Common errors when diagnosing P0150 code?

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

How serious is the code P0150?

• An exhaust manifold leak can cause the O2 sensor to think there is too much oxygen in the exhaust and the ECM will enrich the mixture to compensate for this, thus consuming the excess fuel.
• The O2 sensor may not read correctly if exhaust gas leaks in front of the sensor.
• The ECM may remain open looped until the O2 system is repaired or the O2 sensor is reset, causing long-term rich conditions that can damage other engine components.

What repairs can fix a P0150 code?

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

Additional comments on the consideration of code P0150

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