P0139 2004 Infiniti G35 Code - HO2S12 Slow Response
Quick Answer
The Heated Oxygen Sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. 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 2004 Infiniti G35 indicates HO2S12 Slow Response.
- 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 2004 Infiniti G35 Description
What are the Possible Causes of the DTC P0139 2004 Infiniti G35?
- 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 2004 Infiniti G35?
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 2004 Infiniti G35 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 2004 Infiniti G35 Code
1. What does OBDII code P0139 in a 2004 Infiniti G35 indicate?
This code, HO2S12 Slow Response, specifically points to a slow response from the oxygen sensor located downstream of the catalytic converter in bank 1.
2. What are the common symptoms of OBDII code P0139 in a 2004 Infiniti G35?
Common symptoms include poor fuel economy, rough idling, engine hesitation, and potentially an illuminated check engine light on the dashboard.
3. What are the possible causes of OBDII code P0139 in a 2004 Infiniti G35?
Potential causes include a faulty oxygen sensor, wiring issues in the sensor circuit, exhaust leaks, or issues with the catalytic converter.
4. How can I diagnose the source of OBDII code P0139 in my 2004 Infiniti G35?
Diagnosing this code typically involves checking the oxygen sensor's wiring and connections, inspecting the sensor for damage, and using a scan tool to monitor sensor data for proper operation.
5. Can I still drive my 2004 Infiniti G35 with OBDII code P0139 present?
While driving with this code may be possible, it is recommended to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.
6. How do I repair OBDII code P0139 in my 2004 Infiniti G35?
Repair options may include replacing the oxygen sensor, repairing any damaged wiring, fixing exhaust leaks, or addressing issues with the catalytic converter if necessary.
7. Is it possible to reset the check engine light after fixing OBDII code P0139 in a 2004 Infiniti G35?
Yes, once the underlying issue causing the code has been resolved, the check engine light can be reset using an OBDII scan tool to clear the code from the vehicle's memory.
8. How much does it typically cost to fix OBDII code P0139 in a 2004 Infiniti G35?
The cost of repairs for this code can vary depending on the specific issue, but it may range from around $100 for a new oxygen sensor to several hundred dollars for more complex repairs involving the catalytic converter.
9. Can I prevent OBDII code P0139 from occurring in my 2004 Infiniti G35?
Regular maintenance, such as replacing oxygen sensors at recommended intervals and addressing any exhaust system issues promptly, can help prevent this code from appearing in the future.
10. How long does it take to repair OBDII code P0139 in a 2004 Infiniti G35?
The repair time can vary based on the exact cause of the code and the complexity of the fix, but it typically takes a few hours to a full day to diagnose and repair the issue.
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