P0139 2010 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 2010 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 2010 Ford Fusion Description
What are the Possible Causes of the DTC P0139 2010 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 2010 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 2010 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 2010 Ford Fusion Code
1. What does the OBDII code P0139 mean for a 2010 Ford Fusion?
The P0139 code indicates that the oxygen sensor in Bank 1 Sensor 2 is taking too long to respond to changes in the air-fuel mixture, suggesting a slow response time.
2. What are the common symptoms of code P0139 in a 2010 Ford Fusion?
Symptoms may include a check engine light, reduced fuel efficiency, poor engine performance, or a noticeable delay in throttle response.
3. What causes the P0139 code to appear on a 2010 Ford Fusion?
Common causes include a failing downstream O2 sensor, exhaust leaks, a clogged catalytic converter, or wiring issues like damaged or corroded connections.
4. Which oxygen sensor is affected by the P0139 code on a 2010 Ford Fusion?
The P0139 code refers to the downstream oxygen sensor (Sensor 2) on Bank 1, which monitors the efficiency of the catalytic converter.
5. Can a dirty air filter cause the P0139 code on a 2010 Ford Fusion?
While unlikely, a dirty air filter can indirectly affect air-fuel mixture and sensor performance, potentially contributing to the code under certain conditions.
6. How can I diagnose the P0139 code on a 2010 Ford Fusion?
Diagnosis involves inspecting the downstream O2 sensor and its wiring, checking for exhaust leaks, and monitoring live data with a scan tool to confirm the sensor's response time.
7. Can I drive my 2010 Ford Fusion with the P0139 code?
Driving with the P0139 code is possible, but it’s not recommended as it may lead to reduced fuel efficiency, poor performance, and potential damage to the catalytic converter over time.
8. How do you fix the P0139 code on a 2010 Ford Fusion?
Repairs may include replacing the downstream O2 sensor, repairing damaged wiring, fixing exhaust leaks, or addressing issues with the catalytic converter.
9. How much does it cost to repair the P0139 code on a 2010 Ford Fusion?
Replacing the O2 sensor typically costs $150–$300, including parts and labor. Additional repairs, like fixing exhaust leaks or replacing the catalytic converter, can increase costs.
10. Can a faulty catalytic converter trigger the P0139 code on a 2010 Ford Fusion?
Yes, a clogged or failing catalytic converter can cause the downstream O2 sensor to respond more slowly, leading to the P0139 code.
Discuss the causes and fixes for P0139 2010 Ford Fusion OBDII Code
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