P0139 Volkswagen Code - HO2S12 Sensor Circuit 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 Volkswagen indicates HO2S12 Sensor Circuit 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 Volkswagen Description
What are the Possible Causes of the DTC P0139 Volkswagen?
- 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 Volkswagen?
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 Volkswagen 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 Volkswagen Code
1. What are the common symptoms of OBDII code P0139 in a Volkswagen?
- Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and the illumination of the check engine light.
2. What does the HO2S12 sensor circuit slow response mean in relation to OBDII code P0139 in a Volkswagen?
- The code indicates that the oxygen sensor (HO2S12) in bank 1 sensor 2 is responding slower than expected, affecting the air-fuel mixture and engine performance.
3. What are the possible causes of OBDII code P0139 in a Volkswagen?
- Potential causes include a faulty oxygen sensor, wiring issues, exhaust leaks, engine misfires, or issues with the engine control module (ECM).
4. How can I diagnose the HO2S12 sensor circuit slow response in my Volkswagen when OBDII code P0139 is triggered?
- Diagnosis involves inspecting the oxygen sensor wiring, checking for exhaust leaks, performing a visual inspection of the sensor, and using a scan tool to monitor sensor data.
5. Can a dirty or contaminated oxygen sensor trigger OBDII code P0139 in a Volkswagen?
- Yes, a dirty or contaminated oxygen sensor can cause slow response times and trigger code P0139. Cleaning or replacing the sensor may be necessary.
6. What are some repair tips for addressing OBDII code P0139 in a Volkswagen?
- Repair tips include checking and repairing any damaged wiring, ensuring proper sensor installation, addressing exhaust leaks, and clearing the code to see if it returns.
7. Is it safe to continue driving my Volkswagen with OBDII code P0139 present?
- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.
8. Can a DIY enthusiast tackle the repair for OBDII code P0139 in a Volkswagen?
- Depending on the root cause, some DIY enthusiasts with automotive repair experience may be able to address the issue by following repair guides and utilizing basic tools.
9. Will resetting the check engine light make OBDII code P0139 disappear permanently in a Volkswagen?
- Simply resetting the check engine light without addressing the underlying issue causing code P0139 will not make the code disappear permanently; it is likely to reappear.
10. How much can I expect to pay for professional repairs related to OBDII code P0139 in a Volkswagen?
- Repair costs for OBDII code P0139 can vary based on the root cause and labor rates, but expect to pay anywhere from $100 to $300 or more, depending on the needed repairs.
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