P0057 Subaru Code - HO2S22 Heater Control Circuit Low
Quick Answer
The P0057 diagnostic trouble code (DTC) in a Subaru refers to an issue with the HO2S22 (Heated Oxygen Sensor 2 Bank 2). Common causes include Faulty oxygen sensor heater circuit, Wiring issues or shorts in the HO2S22 circuit, Blown fuse related to the oxygen sensor heater. 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
- P0057 Subaru indicates HO2S22 Heater Control Circuit Low.
- Common causes
- Common causes include Faulty oxygen sensor heater circuit, Wiring issues or shorts in the HO2S22 circuit, Blown fuse related to the oxygen sensor heater.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0057 Subaru Description
The P0057 diagnostic trouble code (DTC) in a Subaru refers to an issue with the HO2S22 (Heated Oxygen Sensor 2 Bank 2). This code indicates that the heater control circuit for the oxygen sensor located after the catalytic converter in bank 2 is experiencing low voltage. The oxygen sensor plays a crucial role in monitoring the amount of oxygen in the exhaust gases, allowing the engine control module (ECM) to adjust the air-fuel mixture for optimal performance and emissions control.
Common Causes of P0057 Subaru
- Faulty oxygen sensor heater circuit
- Wiring issues or shorts in the HO2S22 circuit
- Blown fuse related to the oxygen sensor heater
- Damaged or degraded oxygen sensor
- Malfunctioning engine control module (ECM)
Symptoms of P0057 Subaru
- Decreased fuel efficiency
- Engine misfires
- Rough idling or stalling
- Check Engine Light illuminated
- Failed emissions test
How to Fix P0057 Subaru
- Use an OBD-II scanner to confirm the P0057 code is present and diagnose the underlying cause.
- Inspect the wiring and connections related to the HO2S22 heater circuit for any damage or corrosion.
- Check the fuse related to the oxygen sensor heater and replace if necessary.
- Test the oxygen sensor itself for proper operation and replace if it is faulty.
- Clear the code with the scanner and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0057 Subaru
The cost of repairing a P0057 code in a Subaru can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair cost for this code can range from $150 to $400, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary based on location, vehicle make and model, and engine type. It's recommended to consult with a trusted mechanic or dealership to get a more accurate estimate based on your specific circumstances.
Tech Notes for P0057 Subaru
When is the Code Detected?
Need more information about the P0057 Subaru code?
Need more information on how to fix the P0057 Subaru code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0057 Subaru code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0057 Subaru Code
1. What does the OBDII code P0057 mean on a Subaru?
P0057 indicates a problem with the Heater Control Circuit Low for the downstream oxygen sensor (HO2S22) on Bank 2, meaning there’s insufficient voltage or power to the sensor's heater.
2. What are the common symptoms of a P0057 code in a Subaru?
Symptoms may include an illuminated check engine light, decreased fuel efficiency, poor engine performance, or an extended time for the oxygen sensor to reach operating temperature.
3. What causes the P0057 code on a Subaru?
Common causes include a faulty oxygen sensor, a damaged wiring harness or connector, a blown fuse, or a failed engine control module (ECM).
4. Can I drive my Subaru with a P0057 code?
Yes, you can drive the vehicle, but it’s not recommended for long periods. Prolonged driving with this code can lead to reduced fuel efficiency and potential damage to the catalytic converter.
5. How do I diagnose the P0057 code on a Subaru?
Start by inspecting the oxygen sensor wiring and connectors for damage or corrosion. Next, check the fuse for the heater circuit, and test the oxygen sensor heater resistance with a multimeter.
6. How do you fix the P0057 code on a Subaru?
Repairs may involve replacing the faulty downstream oxygen sensor, repairing or replacing damaged wiring, replacing a blown fuse, or in rare cases, reprogramming or replacing the ECM.
7. How much does it cost to repair a P0057 code on a Subaru?
Repair costs can vary. Replacing an oxygen sensor typically costs $150–$400, while fixing wiring or connectors may cost less. ECM replacement is more expensive, ranging from $500–$1,200.
8. What tools do I need to fix the P0057 code on a Subaru?
Tools may include an OBDII scanner, a multimeter, a socket set, a wiring repair kit, and potentially a replacement oxygen sensor.
9. Can a P0057 code cause other problems if not fixed?
Yes, if left unresolved, it can lead to poor engine performance, reduced fuel economy, or damage to the catalytic converter over time.
10. Does clearing the P0057 code fix the problem on a Subaru?
Clearing the code will turn off the check engine light temporarily, but the code will return unless the underlying issue is resolved.
Discuss the causes and fixes for P0057 Subaru OBDII Code
Code P0057 Subaru comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.