P0139 2008 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 2008 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 2008 Ford Fusion Description
What are the Possible Causes of the DTC P0139 2008 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 2008 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 2008 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 2008 Ford Fusion Code
1. What are the common symptoms of OBDII code P0139 on a 2008 Ford Fusion?
- Common symptoms include a check engine light illuminated on the dashboard, poor fuel economy, rough idling, and decreased engine performance.
2. What does the OBDII code P0139 "O2 Sensor Circuit Slow Response Bank 1 Sensor 2" mean on a 2008 Ford Fusion?
- This code indicates that the oxygen sensor located downstream of the catalytic converter on Bank 1 is responding slowly or intermittently.
3. What are the possible causes of OBDII code P0139 on a 2008 Ford Fusion?
- Possible causes include a faulty oxygen sensor, wiring issues in the O2 sensor circuit, exhaust leaks, or a malfunctioning catalytic converter.
4. How can I diagnose the O2 sensor circuit slow response issue on my 2008 Ford Fusion?
- Diagnose by visually inspecting the O2 sensor and its wiring for damage, checking for exhaust leaks, testing the sensor's voltage output, and using a scan tool to monitor sensor data.
5. Can I drive my 2008 Ford Fusion with the OBDII code P0139 without repairing it immediately?
- It is not recommended to drive with this code for an extended period as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.
6. How do I repair the O2 sensor circuit slow response issue on my 2008 Ford Fusion?
- Repair options include replacing the Bank 1 Sensor 2 oxygen sensor, repairing any damaged wiring, fixing exhaust leaks, or replacing the catalytic converter if necessary.
7. Will resetting the OBDII code P0139 on my 2008 Ford Fusion make it go away permanently?
- Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not fixed, the code is likely to return after driving the vehicle for a while.
8. How much does it typically cost to repair the O2 sensor circuit slow response issue on a 2008 Ford Fusion?
- The cost of repairs can vary depending on the specific cause, but replacing the oxygen sensor or repairing wiring issues may range from $150 to $400, while replacing the catalytic converter can cost more.
9. Can a DIY enthusiast fix the OBDII code P0139 issue on a 2008 Ford Fusion?
- DIY enthusiasts with the right tools and knowledge can potentially diagnose and replace the oxygen sensor or repair wiring issues themselves, but more complex repairs may require professional assistance.
10. How often should the oxygen sensors be replaced on a 2008 Ford Fusion to prevent O2 sensor circuit slow response issues?
- Oxygen sensors typically last around 60,000 to 100,000 miles, so it's recommended to replace them within this mileage range to avoid issues like slow response and decreased fuel efficiency.
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