AutoCodes – Ford – P0155 2011 Ford Fusion

P0155 2011 Ford Fusion Code - O2 Heater Circuit Bank 2 Sensor 1

Quick Answer

During testing the heated oxygen sensor (HO2S) heaters are checked for open and short circuits and excessive current draw. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground. 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 2011 Ford Fusion indicates O2 Heater Circuit Bank 2 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground.
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.

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Code Popularity 5,254

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0155 2011 Ford Fusion Description

During testing the heated oxygen sensor (HO2S) heaters are checked for open and short circuits and excessive current draw. The test fails when the current draw exceeds a calibrated limit or an open or short circuit is detected.

OBDII Code P0155 2011 Ford Fusion - O2 Heater Circuit Bank 2 Sensor 1 - AutoCodes.com — P0155 2011 Ford Fusion Code - O2 Heater Circuit Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0155 2011 Ford Fusion?

Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse
Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground
Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0155 2011 Ford Fusion?

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.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0155 2011 Ford Fusion 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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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 2011 Ford Fusion Code

1. What does the OBDII code P0155 for a 2011 Ford Fusion mean?

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

2. What are the common symptoms of a P0155 code in a 2011 Ford Fusion?

- Common symptoms include decreased fuel efficiency, rough idling, engine misfires, and the illumination of the check engine light.

3. What are the potential causes of a P0155 code in a 2011 Ford Fusion?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a problem with the vehicle's engine control module (ECM).

4. How can I diagnose a P0155 code in my 2011 Ford Fusion?

- Diagnosing a P0155 code involves using an OBDII scanner to retrieve the code, visually inspecting the sensor and its wiring for damage, and testing the sensor's heater circuit.

5. Can I continue driving my 2011 Ford Fusion with a P0155 code?

- It is not recommended to drive the vehicle with a P0155 code as it can lead to poor engine performance and potential long-term damage if left unresolved.

6. How should I repair a P0155 code in my 2011 Ford Fusion?

- Repairing a P0155 code may involve replacing the faulty oxygen sensor, repairing damaged wiring or connectors, checking and replacing fuses if necessary, or reprogramming the ECM.

7. Are there any DIY tips for fixing a P0155 code in a 2011 Ford Fusion?

- DIY tips include ensuring the oxygen sensor is properly connected, checking for visible signs of damage to the sensor or wiring, and consulting the vehicle's service manual for specific repair procedures.

8. How much does it cost to repair a P0155 code in a 2011 Ford Fusion?

- The cost of repairing a P0155 code can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can a P0155 code in a 2011 Ford Fusion cause emissions test failures?

- Yes, a P0155 code can cause emissions test failures due to the impact on the vehicle's emissions control system.

10. How often does a P0155 code occur in a 2011 Ford Fusion?

- The occurrence of a P0155 code can vary, but it is not uncommon in vehicles with higher mileage or older oxygen sensors. Regular maintenance can help prevent this code from appearing.