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Engine-Codes – Ford – P0155 Ford

P0155 Ford Code - O2 Heater Circuit Bank 2 Sensor 1

Quick Answer

The P0155 Ford code refers to a fault in the O2 sensor heater circuit for Bank 2 Sensor 1. Common causes include Faulty O2 Sensor: The sensor itself may be damaged or worn out, causing the heater circuit to malfunction, Wiring Issues: Damaged or corroded wiring leading to the O2 sensor can disrupt the heater circuit's operation, Blown Fuse: A blown fuse in the O2 sensor heater circuit can prevent the heater from functioning properly. 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 Ford indicates O2 Heater Circuit Bank 2 Sensor 1.
Common causes
Common causes include Faulty O2 Sensor: The sensor itself may be damaged or worn out, causing the heater circuit to malfunction, Wiring Issues: Damaged or corroded wiring leading to the O2 sensor can disrupt the heater circuit's operation, Blown Fuse: A blown fuse in the O2 sensor heater circuit can prevent the heater from functioning properly.
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 08, 2024
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Code P0155 Ford Description

The P0155 Ford code refers to a fault in the O2 sensor heater circuit for Bank 2 Sensor 1. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) for optimal fuel efficiency and emissions control. The heater circuit is designed to bring the sensor up to operating temperature quickly to improve accuracy and responsiveness.

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

Common Causes of P0155 Ford

  1. Faulty O2 Sensor: The sensor itself may be damaged or worn out, causing the heater circuit to malfunction.
  2. Wiring Issues: Damaged or corroded wiring leading to the O2 sensor can disrupt the heater circuit's operation.
  3. Blown Fuse: A blown fuse in the O2 sensor heater circuit can prevent the heater from functioning properly.
  4. Faulty ECM: A malfunctioning Engine Control Module may not be providing the correct signals to the O2 sensor heater circuit.
  5. Electrical System Problems: Issues with the vehicle's electrical system can also lead to a malfunction in the O2 sensor heater circuit.

Symptoms of P0155 Ford

  1. Check Engine Light: The most obvious symptom of this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning O2 sensor heater circuit can lead to decreased fuel efficiency as the engine runs less efficiently.
  3. Rough Idling: Inaccurate oxygen sensor readings can result in rough idling or poor engine performance.
  4. Failed Emissions Test: This issue can cause the vehicle to fail emissions tests due to increased emissions levels.
  5. Engine Misfires: Incorrect air-fuel mixture adjustments can lead to engine misfires and rough running conditions.

How to Fix P0155 Ford

  1. Diagnostic: Use an OBD-II scanner to read and clear the code, then perform a thorough inspection of the O2 sensor and heater circuit to pinpoint the issue.
  2. Replace O2 Sensor: If the O2 sensor is determined to be faulty, replace it with a new sensor designed for your vehicle's make and model.
  3. Check Wiring: Inspect the wiring leading to the O2 sensor for any damage or corrosion, repairing or replacing as needed.
  4. Fuse Replacement: If a blown fuse is the cause of the issue, replace it with a new fuse of the correct amperage rating.
  5. ECM Testing: If all other components check out, have the ECM tested to ensure it is functioning properly and sending the correct signals to the O2 sensor heater circuit.

Cost to Fix P0155 Ford

The cost of repairing a P0155 Ford code can vary depending on the specific cause of the issue and the labor rates in your area. In general, the cost of replacing an O2 sensor can range from $150 to $400, including parts and labor. If additional components need to be replaced or repaired, the cost could increase accordingly.

What does this mean?

Tech Notes for P0155 Ford

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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Information for Specific Ford Models

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 Ford Code

1. What is the meaning of OBDII code P0155 Ford?

- OBDII code P0155 for Ford indicates an issue with the O2 sensor heater circuit in Bank 2 Sensor 1, which is the first sensor on the passenger side of the vehicle.

2. What are common symptoms of OBDII code P0155 Ford?

- Common symptoms include increased fuel consumption, poor engine performance, rough idling, and the illumination of the Check Engine light.

3. What are the possible causes of OBDII code P0155 Ford?

- The most common causes include a faulty O2 sensor, damaged wiring or connectors in the heater circuit, a blown fuse, or a problem with the vehicle's computer.

4. How do I diagnose the O2 heater circuit in Bank 2 Sensor 1 for OBDII code P0155 Ford?

- Use a multimeter to check for continuity in the sensor's heater circuit, inspect the wiring and connectors for damage, and ensure the fuse related to the O2 sensor is intact.

5. How can I repair OBDII code P0155 Ford?

- Repair options include replacing the O2 sensor in Bank 2 Sensor 1, repairing any damaged wiring or connectors, ensuring the fuse is in good condition, or resetting the Check Engine light after fixing the issue.

6. Can I drive my vehicle with OBDII code P0155 Ford?

- It is not recommended to drive the vehicle with this code present, as it can lead to poor fuel economy and engine performance issues. It's best to address the problem as soon as possible.

7. How much does it cost to repair OBDII code P0155 Ford?

- The cost of repair can vary depending on the underlying issue. Replacing the O2 sensor can range from $100 to $300, while fixing wiring or fuse problems may be less expensive.

8. Will OBDII code P0155 Ford pass emissions testing?

- The vehicle is likely to fail emissions testing with this code present, as it indicates a problem with the O2 sensor heater circuit, which is crucial for proper emissions control.

9. How often does OBDII code P0155 Ford occur in Ford vehicles?

- This code can occur in Ford vehicles equipped with OBDII systems, particularly in vehicles that have been driven for an extended period or have high mileage.

10. Is it possible to prevent OBDII code P0155 Ford from occurring?

- While some factors leading to this code may be unavoidable, regular maintenance, prompt repairs of sensor issues, and ensuring proper wiring connections can help prevent its occurrence.

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