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Engine-Codes – Ford – P0138 2007 Ford Fusion

P0138 2007 Ford Fusion Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Quick Answer

The P0138 code for a 2007 Ford Fusion indicates a problem with the O2 (oxygen) sensor circuit on Bank 1 Sensor 2, specifically reporting a high voltage condition. Common causes include Faulty O2 sensor, Wiring issues (such as frayed or damaged wires), Exhaust leak near the sensor. 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 2007 Ford Fusion indicates O2 Sensor Circuit High Voltage Bank 1 Sensor 2.
Common causes
Common causes include Faulty O2 sensor, Wiring issues (such as frayed or damaged wires), Exhaust leak near the sensor.
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 17, 2024
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Code P0138 2007 Ford Fusion Description

The P0138 code for a 2007 Ford Fusion indicates a problem with the O2 (oxygen) sensor circuit on Bank 1 Sensor 2, specifically reporting a high voltage condition. The O2 sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. Bank 1 Sensor 2 refers to the downstream sensor on the side of the engine where cylinder 1 is located.

OBDII Code P0138 2007 Ford Fusion - O2 Sensor Circuit High Voltage Bank 1 Sensor 2
P0138 2007 Ford Fusion Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Common Causes of P0138 2007 Ford Fusion

  1. Faulty O2 sensor
  2. Wiring issues (such as frayed or damaged wires)
  3. Exhaust leak near the sensor
  4. ECM software issue
  5. Exhaust system damage or corrosion

Symptoms of P0138 2007 Ford Fusion

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Check Engine Light illuminated
  4. Increased emissions
  5. Poor engine performance

How to Fix P0138 2007 Ford Fusion

  1. Use an OBD-II scanner to confirm the P0138 code and identify the specific sensor causing the issue.
  2. Inspect the wiring harness for any damage or corrosion, and repair or replace as needed.
  3. Check for exhaust leaks near the sensor and repair them to ensure accurate readings.
  4. Replace the Bank 1 Sensor 2 O2 sensor if it is faulty or not providing accurate readings.
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0138 2007 Ford Fusion

The cost of repairing a P0138 code on a 2007 Ford Fusion can vary depending on the specific cause of the issue. On average, the cost of replacing an O2 sensor can range from $150 to $400, including parts and labor. Additional costs may be incurred if wiring repairs or exhaust system fixes are necessary. It is recommended to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of your vehicle. Keep in mind that labor rates at auto repair shops can vary, so it's advisable to check local rates for a more precise estimate.

What does this mean?

Tech Notes for P0138 2007 Ford Fusion

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

When is the Code Detected?

The P0138 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor signal voltage remains excessively high for an extended period of time.

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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 2007 Ford Fusion Code

1. What does OBDII code P0138 mean on a 2007 Ford Fusion?

- OBDII code P0138 for a 2007 Ford Fusion indicates a high voltage in the O2 sensor circuit of Bank 1 Sensor 2, also known as the downstream oxygen sensor.

2. What are the common symptoms of O2 Sensor Circuit High Voltage Bank 1 Sensor 2 (P0138) in a 2007 Ford Fusion?

- Common symptoms of P0138 in a 2007 Ford Fusion include poor fuel efficiency, rough idling, engine hesitation, or an illuminated check engine light.

3. What are the possible causes of O2 Sensor Circuit High Voltage Bank 1 Sensor 2 (P0138) in a 2007 Ford Fusion?

- Causes of P0138 in a 2007 Ford Fusion can include a faulty oxygen sensor, wiring issues in the O2 sensor circuit, exhaust leaks, or a failed PCM (powertrain control module).

4. How can I diagnose O2 Sensor Circuit High Voltage Bank 1 Sensor 2 (P0138) in my 2007 Ford Fusion?

- Diagnosing P0138 in a 2007 Ford Fusion involves using a scan tool to monitor O2 sensor data, checking for wiring faults, inspecting the sensor for damage, and testing the sensor's voltage output.

5. Can I continue driving my 2007 Ford Fusion with OBDII code P0138 (O2 Sensor Circuit High Voltage Bank 1 Sensor 2)?

- It's not recommended to drive your 2007 Ford Fusion with P0138 for an extended period, as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.

6. How do I repair O2 Sensor Circuit High Voltage Bank 1 Sensor 2 (P0138) in a 2007 Ford Fusion?

- Repairing P0138 in a 2007 Ford Fusion typically involves replacing the Bank 1 Sensor 2 oxygen sensor, repairing any wiring issues, and clearing the trouble code with a scan tool.

7. Is it possible to reset the OBDII code P0138 in a 2007 Ford Fusion without repairing the issue?

- While you can clear the P0138 trouble code with a scan tool, it's essential to address the underlying problem to prevent further issues and potential damage to the vehicle.

8. How much does it cost to fix O2 Sensor Circuit High Voltage Bank 1 Sensor 2 (P0138) in a 2007 Ford Fusion?

- The cost of fixing P0138 in a 2007 Ford Fusion varies depending on the cause of the issue, but it typically ranges from $200 to $500, including parts and labor.

9. Can a DIY enthusiast replace the O2 sensor for P0138 in a 2007 Ford Fusion?

- Yes, replacing the O2 sensor for P0138 in a 2007 Ford Fusion is a task that DIY enthusiasts can typically handle with basic tools and some mechanical knowledge.

10. Will resetting the check engine light solve the issue of O2 Sensor Circuit High Voltage Bank 1 Sensor 2 (P0138) in a 2007 Ford Fusion?

- Resetting the check engine light without addressing the underlying problem causing P0138 in a 2007 Ford Fusion will not solve the issue; the problem must be diagnosed and repaired.

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