P0057 Subaru Code - HO2S22 Heater Control Circuit Low
Quick Answer
Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 harness is open shorted, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit poor electrical connection. 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 Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 harness is open shorted, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit poor electrical connection.
- 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.
Code P0057 Subaru Description
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
What are the Possible Causes of the DTC P0057 Subaru?
- Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 harness is open shorted
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit poor electrical connection
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit fuse
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0057 Subaru?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0057 Subaru code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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.
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