P0139 2012 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 2012 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 2012 Ford Fusion Description
What are the Possible Causes of the DTC P0139 2012 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 2012 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 2012 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 2012 Ford Fusion Code
1. What does OBDII code P0139 on a 2012 Ford Fusion mean?
The code P0139 indicates a slow response from the O2 sensor located after the catalytic converter on bank 1, sensor 2.
2. What are the common symptoms of O2 sensor circuit slow response (P0139) in a 2012 Ford Fusion?
Common symptoms include decreased fuel efficiency, rough idling, engine misfires, and an illuminated check engine light.
3. What causes the O2 sensor circuit slow response code (P0139) on a 2012 Ford Fusion?
Possible causes include a faulty oxygen sensor, wiring issues, exhaust leaks, or a problem with the catalytic converter.
4. How can I diagnose the O2 sensor circuit slow response issue (P0139) on my 2012 Ford Fusion?
Diagnosis involves checking the wiring harness for damage, testing the sensor's response with a scan tool, and inspecting the catalytic converter for proper function.
5. Can I drive my 2012 Ford Fusion with the P0139 O2 sensor circuit slow response code?
It is generally safe to drive the vehicle for a short period with this code, but prolonged driving may lead to reduced fuel efficiency and potential damage to the catalytic converter.
6. How do I repair the O2 sensor circuit slow response code (P0139) on my 2012 Ford Fusion?
Repair options include replacing the oxygen sensor, repairing any damaged wiring, fixing exhaust leaks, or replacing the catalytic converter if necessary.
7. Will resetting the check engine light resolve the P0139 O2 sensor circuit slow response code on a 2012 Ford Fusion?
Simply resetting the check engine light will not fix the underlying issue causing the P0139 code. It's important to diagnose and repair the problem to prevent further issues.
8. How much does it cost to fix the O2 sensor circuit slow response code (P0139) on a 2012 Ford Fusion?
Costs can vary depending on the exact cause of the issue. Replacing the oxygen sensor or repairing wiring may cost a few hundred dollars, while replacing the catalytic converter can be more expensive.
9. Can a DIY enthusiast repair the P0139 O2 sensor circuit slow response code on a 2012 Ford Fusion?
Some aspects of diagnosing and repairing this code can be tackled by a DIY enthusiast with the right tools and knowledge, but complex issues may require professional help.
10. How often does the O2 sensor need to be replaced on a 2012 Ford Fusion to prevent the P0139 code from recurring?
The oxygen sensor typically lasts around 100,000 miles, but factors like driving conditions and maintenance practices can affect its lifespan. Regular inspections can help prevent the recurrence of the P0139 code.
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