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P0155 2009 Ford Fusion Code - O2 Heater Circuit Bank 2 Sensor 1

Quick Answer

The P0155 diagnostic trouble code (DTC) for a 2009 Ford Fusion relates to the O2 sensor heater circuit in Bank 2 Sensor 1. Common causes include Faulty O2 sensor heater circuit, Wiring or connector issues in the O2 sensor circuit, Blown fuse related to the O2 sensor heater circuit. 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
P0155 2009 Ford Fusion indicates O2 Heater Circuit Bank 2 Sensor 1.
Common causes
Common causes include Faulty O2 sensor heater circuit, Wiring or connector issues in the O2 sensor circuit, Blown fuse related to the O2 sensor heater circuit.
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 14, 2024
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Code P0155 2009 Ford Fusion Description

The P0155 diagnostic trouble code (DTC) for a 2009 Ford Fusion relates to the O2 sensor heater circuit in Bank 2 Sensor 1. This code indicates that there is a malfunction in the oxygen sensor's heating element, which is responsible for ensuring accurate readings of the oxygen levels in the exhaust gases. The O2 sensor plays a crucial role in monitoring the air-fuel ratio and emissions levels in the vehicle. When the heater circuit malfunctions, it can lead to inaccurate readings and affect the engine's performance and emissions control system.

OBDII Code P0155 2009 Ford Fusion - O2 Heater Circuit Bank 2 Sensor 1
P0155 2009 Ford Fusion Code - O2 Heater Circuit Bank 2 Sensor 1

Common Causes of P0155 2009 Ford Fusion

  1. Faulty O2 sensor heater circuit.
  2. Wiring or connector issues in the O2 sensor circuit.
  3. Blown fuse related to the O2 sensor heater circuit.
  4. Engine coolant temperature sensor malfunction.
  5. PCM (Powertrain Control Module) failure.

Symptoms of P0155 2009 Ford Fusion

  1. Check engine light illuminated on the dashboard.
  2. Decreased fuel efficiency.
  3. Rough idling or stalling.
  4. Hesitation during acceleration.
  5. Increased emissions.

How to Fix P0155 2009 Ford Fusion

  1. Begin by diagnosing the issue using a scan tool to confirm the P0155 code and pinpoint the specific O2 sensor involved.
  2. Inspect the wiring and connectors related to the O2 sensor heater circuit for any damage or corrosion. Repair or replace as necessary.
  3. Check the fuse associated with the O2 sensor heater circuit and replace if blown.
  4. Test the O2 sensor heater circuit resistance to determine if the sensor itself is faulty. Replace the O2 sensor if needed.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0155 2009 Ford Fusion

The typical repair costs for addressing a P0155 code on a 2009 Ford Fusion can range from $150 to $400, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may offer lower rates. It's recommended to check with local shops for a more accurate estimate based on your specific circumstances.

What does this mean?

Tech Notes for P0155 2009 Ford Fusion

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The Engine Control Module (ECM) monitors how long it take the sensor to warm up and start sending an adequate signal. The code means the the sensor is taking too long to warm up. Replacing the Front Heated Oxygen Sensor (H2OS) Bank 2 usually takes care of the problem.

When is the Code Detected?

The current amperage in the front heated oxygen sensor heater circuit is out of the normal range. (An improper voltage drop signal is sent to ECM through the front heated oxygen sensor heater)

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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 P0155 2009 Ford Fusion Code

1. What does OBDII code P0155 on a 2009 Ford Fusion mean?

The code P0155 indicates an issue with the O2 sensor heater circuit in Bank 2 Sensor 1 of the vehicle.

2. What are the common symptoms of OBDII code P0155 in a 2009 Ford Fusion?

Common symptoms of this code may include poor fuel economy, rough idling, engine misfires, and an illuminated check engine light.

3. What are the potential causes of OBDII code P0155 in a 2009 Ford Fusion?

Possible causes of this code include a faulty O2 sensor, damaged wiring or connectors in the sensor circuit, or a blown fuse related to the O2 sensor heater.

4. How can I diagnose OBDII code P0155 in my 2009 Ford Fusion?

Diagnosing this code usually involves checking the O2 sensor heater circuit for continuity, inspecting wiring for damage, and testing the sensor's heater resistance using a multimeter.

5. Can I still drive my 2009 Ford Fusion with OBDII code P0155?

While you can drive the vehicle with this code, it is advisable to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.

6. How can I repair OBDII code P0155 in my 2009 Ford Fusion?

Repairing this code typically involves replacing the faulty O2 sensor in Bank 2 Sensor 1, repairing any damaged wiring or connectors, and ensuring the sensor heater circuit is functioning properly.

7. Is it possible to clear OBDII code P0155 in a 2009 Ford Fusion without fixing the issue?

Clearing the code without addressing the underlying problem may temporarily turn off the check engine light, but the issue will likely reoccur, affecting the vehicle's performance and emissions.

8. Will OBDII code P0155 in a 2009 Ford Fusion cause the vehicle to fail an emissions test?

Yes, this code can cause the vehicle to fail an emissions test due to improper oxygen sensor function, which affects the vehicle's emissions levels.

9. How much does it cost to repair OBDII code P0155 in a 2009 Ford Fusion?

The cost of repairing this code can vary depending on the cause of the issue, the labor rates of the repair shop, and whether genuine Ford parts are used. It is recommended to obtain quotes from reputable mechanics.

10. How often does OBDII code P0155 occur in a 2009 Ford Fusion?

The occurrence of this code can vary depending on the vehicle's mileage, maintenance history, and driving conditions. Regular maintenance and timely O2 sensor replacements can help prevent this code from appearing frequently.

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