AutoCodes – Ford – P0138 2011 Ford Fusion

P0138 2011 Ford Fusion Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Quick Answer

The heated oxygen sensor (HO2S) signals are monitored for an over voltage condition. Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 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: P0138 2011 Ford Fusion indicates O2 Sensor Circuit High Voltage Bank 1 Sensor 2.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 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.

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Code Popularity 5,034

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 P0138 2011 Ford Fusion Description

The heated oxygen sensor (HO2S) signals are monitored for an over voltage condition. The code is set when the HO2S signal voltage is 1.5 volts or greater.

OBDII Code P0138 2011 Ford Fusion - O2 Sensor Circuit High Voltage Bank 1 Sensor 2 - AutoCodes.com — P0138 2011 Ford Fusion Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0138 2011 Ford Fusion?

Faulty Rear Heated Oxygen Sensor Bank 1
Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
Intake air leaks
Exhaust gas leaks
Inappropriate fuel pressure
Faulty fuel injectors

How to Fix the DTC P0138 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

Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0138 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 P0138 2011 Ford Fusion Code

1. What does OBDII code P0138 on a 2011 Ford Fusion mean?

- OBDII code P0138 indicates a high voltage condition in the O2 sensor circuit for Bank 1 Sensor 2 in a 2011 Ford Fusion.

2. What are the common symptoms of O2 sensor circuit high voltage Bank 1 Sensor 2 issue?

- Common symptoms include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light.

3. What can cause the O2 sensor circuit high voltage issue in a 2011 Ford Fusion?

- Possible causes include a faulty O2 sensor, damaged wiring or connectors, exhaust leaks, engine misfires, or a malfunctioning PCM.

4. How can I diagnose the O2 sensor circuit high voltage issue in my 2011 Ford Fusion?

- Diagnose the problem by checking the O2 sensor's voltage readings, inspecting the wiring and connectors for damage, and performing a visual inspection of the exhaust system.

5. Can I drive my 2011 Ford Fusion with the O2 sensor circuit high voltage issue?

- It is not recommended to drive the vehicle with this issue as it can lead to further damage and reduced fuel efficiency.

6. How do I repair the O2 sensor circuit high voltage Bank 1 Sensor 2 problem in my 2011 Ford Fusion?

- Repair options include replacing the faulty O2 sensor, repairing damaged wiring or connectors, fixing any exhaust leaks, and resetting the fault code.

7. What tools might I need to diagnose and repair the O2 sensor circuit high voltage issue?

- Common tools needed include a multimeter for voltage testing, a scan tool for reading fault codes, wrenches for sensor removal, and a soldering iron for wiring repairs.

8. Is it possible to reset the OBDII code P0138 in a 2011 Ford Fusion after fixing the issue?

- Yes, the code can be cleared using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

9. How often should I check the O2 sensor circuit in my 2011 Ford Fusion for potential issues?

- It is recommended to include O2 sensor checks as part of regular vehicle maintenance or whenever you experience symptoms of poor engine performance.

10. Can a DIY enthusiast with basic knowledge fix the O2 sensor circuit high voltage issue in a 2011 Ford Fusion?

- Depending on the individual's skill level, a DIY enthusiast with basic knowledge of automotive repair may be able to diagnose and fix this issue, especially with the help of online resources and repair guides.