P0139 2012 Nissan Altima Sedan 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 2012 Nissan Altima Sedan 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 2012 Nissan Altima Sedan Description
What are the Possible Causes of the DTC P0139 2012 Nissan Altima Sedan?
- 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 Nissan Altima Sedan?
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 Nissan Altima Sedan 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 Nissan Altima Sedan Code
1. What does OBDII code P0139 on my 2012 Nissan Altima Sedan mean?
Code P0139 stands for "HO2S12 Slow Response," indicating a delayed response from the downstream oxygen sensor (HO2S12) in bank 1 sensor 2.
2. What are the common symptoms of a HO2S12 Slow Response error code?
Common symptoms include poor fuel economy, rough idle, engine misfires, and the illumination of the Check Engine Light on the dashboard.
3. What are the possible causes of a P0139 code on a 2012 Nissan Altima Sedan?
Potential causes include a faulty oxygen sensor, wiring issues, exhaust leaks, engine misfires, vacuum leaks, or issues with the engine's air-fuel mixture.
4. How can I diagnose the source of a HO2S12 Slow Response code on my Nissan Altima?
Diagnosis typically involves inspecting the oxygen sensor, checking for wiring damage or corrosion, inspecting the exhaust system for leaks, and verifying the engine's fuel system components.
5. Can a P0139 code be triggered by a loose gas cap on a 2012 Nissan Altima Sedan?
While a loose gas cap can trigger other codes related to the evaporative emission system, it is unlikely to cause a HO2S12 Slow Response error code.
6. What are the potential repair options for resolving a P0139 code on a 2012 Nissan Altima Sedan?
Repair options may include replacing the downstream oxygen sensor, repairing damaged wiring, fixing exhaust leaks, addressing engine misfires, and ensuring proper air-fuel mixture.
7. Is it safe to continue driving my 2012 Nissan Altima Sedan with a P0139 code?
It is generally not recommended to ignore a P0139 code, as it can lead to reduced fuel efficiency and potential damage to the vehicle's catalytic converter over time.
8. How much does it typically cost to fix a P0139 code on a 2012 Nissan Altima Sedan?
The cost of repairs can vary depending on the specific cause of the code, but it may involve parts and labor expenses ranging from $100 to $300 or more.
9. Can I reset the Check Engine Light after fixing a P0139 code on my Nissan Altima Sedan?
Once the underlying issue triggering the code has been resolved, the Check Engine Light can be reset using an OBDII scanner or by disconnecting the car's battery for a few minutes.
10. Will a P0139 code on a 2012 Nissan Altima Sedan affect the vehicle's emissions or performance?
Yes, a P0139 code can impact emissions levels and engine performance, potentially leading to decreased fuel efficiency and increased harmful emissions if left unresolved.
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