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Engine-Codes – Subaru – P0050 Subaru

P0050 Subaru Code - HO2S 21 Heater Control Circuit

Quick Answer

The diagnostic trouble code (DTC) P0050 for Subaru vehicles refers to an issue with the HO2S (Heated Oxygen Sensor) 21 Heater Control Circuit. Common causes include Faulty oxygen sensor, Damaged wiring or connectors, Blown fuse. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0050 Subaru indicates HO2S 21 Heater Control Circuit.
Common causes
Common causes include Faulty oxygen sensor, Damaged wiring or connectors, Blown fuse.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P0050 Subaru Description

The diagnostic trouble code (DTC) P0050 for Subaru vehicles refers to an issue with the HO2S (Heated Oxygen Sensor) 21 Heater Control Circuit. The HO2S, also known as the oxygen sensor, plays a crucial role in monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The heater control circuit within the sensor ensures that it reaches operating temperature quickly for accurate readings.

OBDII Code P0050 Subaru - HO2S 21 Heater Control Circuit
P0050 Subaru Code - HO2S 21 Heater Control Circuit

Common Causes of P0050 Subaru

  1. Faulty oxygen sensor
  2. Damaged wiring or connectors
  3. Blown fuse
  4. Malfunctioning ECM

Symptoms of P0050 Subaru

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Increased emissions
  4. Engine misfires
  5. Check Engine Light illuminated

How to Fix P0050 Subaru

  1. Use a scan tool to confirm the P0050 code and pinpoint the exact cause of the issue.
  2. Inspect the wiring and connectors for any damage or corrosion. Repair or replace as necessary.
  3. Check the fuse related to the HO2S heater circuit and replace if blown.
  4. Test the HO2S sensor using a multimeter to determine if it is functioning correctly. Replace if necessary.
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0050 Subaru

The cost of repairing the HO2S 21 Heater Control Circuit can vary depending on the specific cause of the issue. On average, replacing an oxygen sensor can cost between $200 and $300, including parts and labor. However, if the issue is related to wiring or the ECM, the cost could increase significantly. It's recommended to consult with a trusted mechanic for a more accurate cost estimate based on your vehicle's make and model. Additionally, labor rates can vary, so it's advisable to inquire about rates at local auto repair shops.

What does this mean?

Tech Notes for P0050 Subaru

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors.

When is the Code Detected?

The P0050 is set when the ECM detects an open or shorted to ground condition on the heated oxygen sensor heater circuit

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0050 Subaru Code

1. What is OBDII code P0050 for a Subaru?

OBDII code P0050 in a Subaru specifically refers to the Heater Control Circuit malfunction in the HO2S (Heated Oxygen Sensor) 21, which is typically the sensor located after the catalytic converter.

2. What are the common symptoms of OBDII code P0050 in a Subaru?

Common symptoms of OBDII code P0050 in a Subaru may include poor fuel economy, rough idling, engine misfires, and an illuminated check engine light on the dashboard.

3. What are the potential causes of OBDII code P0050 in a Subaru?

The potential causes of OBDII code P0050 in a Subaru can include a faulty HO2S 21 sensor, damaged wiring or connectors in the heater circuit, a blown fuse related to the sensor, or issues with the vehicle's ECM (Engine Control Module).

4. How can I diagnose OBDII code P0050 in a Subaru?

To diagnose OBDII code P0050 in a Subaru, you can use an OBDII scanner to retrieve the specific fault code, inspect the wiring and connectors related to the HO2S 21 sensor, check the sensor's resistance, and test the heater circuit for continuity.

5. Can I continue driving my Subaru with OBDII code P0050?

It is not recommended to continue driving your Subaru with OBDII code P0050, as it can lead to potential engine performance issues and increased emissions. It is best to address the underlying problem as soon as possible.

6. How can I repair OBDII code P0050 in a Subaru?

To repair OBDII code P0050 in a Subaru, you may need to replace the HO2S 21 sensor, repair any damaged wiring or connectors, replace a blown fuse if necessary, and clear the fault code with an OBDII scanner.

7. Can a DIY enthusiast fix OBDII code P0050 in a Subaru?

If you have the necessary tools, knowledge, and experience working on automotive electrical systems, you may be able to fix OBDII code P0050 in a Subaru yourself. However, if you are unsure, it is recommended to seek professional help.

8. What is the typical cost to repair OBDII code P0050 in a Subaru?

The cost to repair OBDII code P0050 in a Subaru can vary depending on the underlying issue, the labor rates in your area, and whether you choose to fix it yourself or take it to a mechanic. It may range from $100 to $300 or more.

9. Will OBDII code P0050 cause my Subaru to fail an emissions test?

Yes, OBDII code P0050 in a Subaru can potentially cause the vehicle to fail an emissions test, as it indicates a problem with the HO2S 21 sensor's heater circuit, which is crucial for proper emissions control.

10. How often does OBDII code P0050 occur in Subarus?

OBDII code P0050 related to the HO2S 21 sensor heater circuit can occur in Subarus with higher mileage or older models, as sensors and wiring may deteriorate over time. Regular maintenance and inspections can help prevent this issue.

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