P0050 Code – Heated oxygen sensor 1, bank 2, heater control circuit malfunction

Code P0050 is a trouble code that is associated with the malfunctioning of the oxygen sensor in a vehicle. The oxygen sensor in a car plays a critical role in fuel efficiency, emission control and engine performance. When the oxygen sensor is not functioning properly, it can lead to poor fuel economy, increased emissions, and difficulty starting the engine.

The DTC P0050 indicates an issue with the heater circuit in oxygen sensor 1 for bank 2. Oxygen sensor 1 is located on the exhaust manifold and measures the air/fuel ratio of the vehicle. When the code P0050 is triggered, the check engine light on the dash will illuminate. The code will remain stored in the car’s computer (ECM) until the issue is resolved.

Fixes for OBD-II Code P0050

To fix this code, you can follow these steps:

  1. Inspect the wiring: Check the wiring harness and connectors associated with the Bank 2 Sensor 1 oxygen sensor. Look for any signs of damage, such as frayed wires, loose connections, or corrosion. Repair or replace any damaged wiring as necessary.

  2. Check the oxygen sensor: Inspect the Bank 2 Sensor 1 oxygen sensor itself. Ensure it is securely mounted and functioning properly. If the sensor is faulty or damaged, it may need to be replaced.

  3. Test the oxygen sensor heater circuit: Use a multimeter to measure the resistance of the oxygen sensor heater circuit. Refer to the vehicle’s service manual for the specific resistance values. If the resistance is outside of the specified range, it may indicate a problem with the sensor or the heater circuit. In such cases, replacing the oxygen sensor is often the recommended course of action.

  4. Clear the fault codes: After making any necessary repairs or replacements, clear the fault codes using an OBD-II scanner or diagnostic tool (find out right model). This will reset the vehicle’s computer and turn off the Check Engine Light.

It’s important to note that diagnosing and fixing the P0050 code may require advanced knowledge and equipment. If you are unsure or uncomfortable performing these steps yourself, it is recommended to seek assistance from a qualified mechanic or automotive technician.

Related DTCs to P0050

There are some codes that likely would have been shown along with the aforementioned code: P0030.


Can vary depending on factors such as the vehicle make and model, labor rates in your area, and whether you choose to replace the oxygen sensor yourself or have it done by a professional.

The cost of a new sensor can range from $50 to $200 or more, and labor charges can vary between $100 and $200 or higher. As well, it’s best to consult with a trusted mechanic or local repair shop to get an accurate estimate.

Driving with the P0050 code is generally not recommended. It’s because of a potential engine damage if left unresolved, and of the oxygen sensor plays a crucial role in engine control and its performance monitoring.

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