P0139 2007 Ford Fusion Code - O2 Sensor Circuit Slow Response Bank 1 Sensor 2
Quick Answer
The heated oxygen sensor (HO2S) monitor tracks the rate of voltage change during the rise and fall of the HO2S signal. 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
- P0139 2007 Ford Fusion indicates O2 Sensor Circuit Slow Response 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.
Code P0139 2007 Ford Fusion Description
What are the Possible Causes of the DTC P0139 2007 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
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
How to Fix the DTC P0139 2007 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0139 2007 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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Frequently Asked Questions about P0139 2007 Ford Fusion Code
1. What are the common symptoms of OBDII code P0139 in a 2007 Ford Fusion?
- Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and the illumination of the Check Engine Light.
2. What does the O2 Sensor Circuit Slow Response Bank 1 Sensor 2 mean in relation to P0139 on a 2007 Ford Fusion?
- This code indicates that the downstream oxygen sensor in Bank 1 is taking too long to respond to changes in the exhaust oxygen levels.
3. What are the possible causes of OBDII code P0139 on a 2007 Ford Fusion?
- The common causes include a faulty downstream oxygen sensor, wiring issues in the oxygen sensor circuit, exhaust leaks, or a malfunctioning catalytic converter.
4. How can I diagnose the O2 Sensor Circuit Slow Response Bank 1 Sensor 2 issue in my 2007 Ford Fusion?
- Diagnosing this issue requires using a scan tool to monitor the downstream oxygen sensor's response time and checking the wiring connections for any damage or corrosion.
5. Can I drive my 2007 Ford Fusion with an OBDII code P0139?
- It is not recommended to drive with this code as it can lead to poor engine performance and potentially cause damage to the catalytic converter over time.
6. What is the typical repair cost for fixing OBDII code P0139 on a 2007 Ford Fusion?
- The repair cost can vary depending on the exact cause of the issue, but it typically ranges from $150 to $400, including parts and labor.
7. How do I reset the Check Engine Light after repairing the O2 Sensor Circuit Slow Response Bank 1 Sensor 2 on my 2007 Ford Fusion?
- You can reset the Check Engine Light using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the error code.
8. Can I replace the downstream oxygen sensor in my 2007 Ford Fusion myself to fix code P0139?
- Yes, replacing the downstream oxygen sensor is a straightforward task that can be done with basic tools, but ensure you have the correct sensor for your vehicle.
9. Will code P0139 cause my 2007 Ford Fusion to fail an emissions test?
- Yes, having an unresolved P0139 code can cause your vehicle to fail an emissions test due to increased emissions and improper oxygen sensor functionality.
10. How often should I replace the downstream oxygen sensor in my 2007 Ford Fusion to prevent O2 sensor circuit slow response issues?
- The downstream oxygen sensor typically lasts around 60,000 to 90,000 miles, but it's recommended to follow the manufacturer's maintenance schedule for optimal performance and emissions compliance.
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