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Engine-Codes – Ford – P0391 2008 Ford Fusion

P0391 2008 Ford Fusion Code - Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2

Quick Answer

The P0391 diagnostic trouble code (DTC) for a 2008 Ford Fusion indicates a problem with the Camshaft Position Sensor 'B' Circuit Range/Performance in Bank 2. Common causes include Faulty camshaft position sensor, Wiring issues or poor connections in the sensor circuit, Timing belt or chain problems. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0391 2008 Ford Fusion indicates Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2.
Common causes
Common causes include Faulty camshaft position sensor, Wiring issues or poor connections in the sensor circuit, Timing belt or chain problems.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code P0391 2008 Ford Fusion Description

The P0391 diagnostic trouble code (DTC) for a 2008 Ford Fusion indicates a problem with the Camshaft Position Sensor 'B' Circuit Range/Performance in Bank 2. The camshaft position sensor is responsible for monitoring the position of the camshaft in relation to the crankshaft to ensure proper engine timing. In this case, the code suggests that there is a discrepancy between the expected range of the sensor signal and its actual performance. This can lead to issues with engine timing, fuel delivery, and overall performance of the vehicle. If left unaddressed, it can result in poor engine performance, reduced fuel efficiency, and potential damage to the engine over time.

OBDII Code P0391 2008 Ford Fusion - Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2
P0391 2008 Ford Fusion Code - Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2

Common Causes of P0391 2008 Ford Fusion

  1. Faulty camshaft position sensor
  2. Wiring issues or poor connections in the sensor circuit
  3. Timing belt or chain problems
  4. Issues with the engine control module (ECM)
  5. Mechanical engine problems affecting camshaft position

Symptoms of P0391 2008 Ford Fusion

  1. Rough idling or stalling
  2. Decreased fuel efficiency
  3. Engine misfires
  4. Difficulty starting the vehicle
  5. Check Engine Light illuminated on the dashboard

How to Fix P0391 2008 Ford Fusion

  1. Diagnose the issue using a scan tool to confirm the P0391 code and check the camshaft position sensor readings.
  2. Inspect the wiring and connections related to the camshaft position sensor for any damage or corrosion.
  3. Replace the camshaft position sensor if it is found to be faulty.
  4. Check and adjust the timing belt or chain if necessary.
  5. Clear the code and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0391 2008 Ford Fusion

The cost of repairing a P0391 code on a 2008 Ford Fusion can vary depending on the specific cause of the issue. On average, the replacement of a camshaft position sensor can cost between $50 to $200, while labor costs can range from $50 to $150 per hour. Additional costs may be incurred if other components need to be replaced or if there are underlying engine problems. It's recommended to consult with a mechanic or auto repair shop for a more accurate estimate based on the specific circumstances.

What does this mean?

Tech Notes for P0391 2008 Ford Fusion

Sometimes and in some models, low battery voltage or a weak starter can trigger a Camshaft Position Sensor code.

When is the Code Detected?

The camshaft position sensor signal sent to the Engine Control Module (ECM) during the first few seconds of engine cranking is out of range.

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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 P0391 2008 Ford Fusion Code

1. What are the common symptoms of OBDII code P0391 in a 2008 Ford Fusion?

- Common symptoms include engine misfires, rough idling, poor acceleration, and difficulty starting the vehicle.

2. What does the OBDII code P0391 indicate in a 2008 Ford Fusion?

- The code P0391 indicates an issue with the Camshaft Position Sensor 'B' Circuit Range/Performance in Bank 2 of the engine.

3. What are some possible causes of OBDII code P0391 in a 2008 Ford Fusion?

- Possible causes include a faulty camshaft position sensor, wiring issues, a damaged camshaft, timing belt problems, or issues with the engine control module.

4. How can I diagnose the cause of OBDII code P0391 in my 2008 Ford Fusion?

- Diagnosing the issue involves using a scan tool to check for the specific code, inspecting the camshaft position sensor and its wiring, and testing the sensor's functionality.

5. Can I still drive my 2008 Ford Fusion with the OBDII code P0391 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to further engine damage and potentially unsafe driving conditions.

6. How can I repair OBDII code P0391 in my 2008 Ford Fusion?

- Repairing the issue may involve replacing the camshaft position sensor, repairing any damaged wiring, addressing timing belt problems, or resetting the engine control module.

7. Is it possible to reset the OBDII code P0391 in a 2008 Ford Fusion without making repairs?

- While clearing the code may temporarily turn off the check engine light, the underlying issue causing the code will still persist and may lead to further problems if not addressed.

8. How much does it typically cost to repair OBDII code P0391 in a 2008 Ford Fusion?

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

9. Can a DIY enthusiast fix OBDII code P0391 in a 2008 Ford Fusion?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to replace the camshaft position sensor or address wiring issues associated with this code.

10. How can I prevent OBDII code P0391 from occurring in my 2008 Ford Fusion in the future?

- Regular maintenance, such as checking and replacing the camshaft position sensor at recommended intervals, can help prevent the recurrence of this code.

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