P0139 Chevrolet Code - HO2S Slow Response Bank 1 Sensor 2
Quick Answer
The Powertrain Control Module (PCM) provides a .45 volt reference signal to the Heated Oxygen Sensor (HO2S) through the Bank 1 high signal circuit. Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2, HO2S Bank 1 Sensor 2 harness is open or shorted, HO2S Bank 1 Sensor 2circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0139 Chevrolet indicates HO2S Slow Response Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2, HO2S Bank 1 Sensor 2 harness is open or shorted, HO2S Bank 1 Sensor 2circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0139 Chevrolet Description
What are the Possible Causes of the DTC P0139 Chevrolet?
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2
- HO2S Bank 1 Sensor 2 harness is open or shorted
- HO2S Bank 1 Sensor 2circuit poor electrical connection
How to Fix the DTC P0139 Chevrolet?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0139 Chevrolet 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 Chevrolet Code
1. What are the common symptoms of OBDII code P0139 in a Chevrolet vehicle?
- Common symptoms include a check engine light illuminated on the dashboard, rough idling, decreased fuel efficiency, and possible hesitation during acceleration.
2. What does the OBDII code P0139 "HO2S Slow Response Bank 1 Sensor 2" mean for a Chevrolet?
- This code indicates a slow response from the downstream oxygen sensor (Sensor 2) located after the catalytic converter on Bank 1 of the engine.
3. What are the potential causes of OBDII code P0139 in a Chevrolet?
- Common causes include a faulty oxygen sensor (Bank 1 Sensor 2), wiring issues, exhaust leaks, a malfunctioning catalytic converter, or a problem with the engine control module (ECM).
4. How can I diagnose the root cause of OBDII code P0139 in my Chevrolet?
- Diagnosing the issue may involve inspecting the oxygen sensor and its wiring, checking for exhaust leaks, testing the catalytic converter, and scanning the ECM for any related faults.
5. Can driving with an unresolved P0139 code cause further damage to my Chevrolet?
- While driving with this code may not immediately harm your vehicle, it can lead to decreased fuel efficiency, increased emissions, and potential damage to the catalytic converter if left unrepaired for an extended period.
6. Is it safe to continue driving my Chevrolet with the check engine light on due to code P0139?
- It is generally safe to drive your vehicle with this code as long as the symptoms are not severe. However, it is recommended to have the issue diagnosed and repaired at your earliest convenience.
7. What is the typical repair process for OBDII code P0139 in a Chevrolet?
- The repair process usually involves replacing the Bank 1 Sensor 2 oxygen sensor, repairing any damaged wiring, fixing exhaust leaks, or addressing any other underlying issues causing the slow response.
8. Can I fix the OBDII code P0139 in my Chevrolet myself, or do I need to take it to a professional mechanic?
- While some DIY enthusiasts may be able to replace the oxygen sensor or address wiring issues themselves, it is recommended to consult a professional mechanic for proper diagnosis and repair of this code.
9. How much does it cost to repair OBDII code P0139 in a Chevrolet?
- The cost of repairing this code can vary depending on the root cause of the issue, the cost of parts, and labor rates. It is advisable to get estimates from local mechanics or dealerships for an accurate cost assessment.
10. Are there any preventative maintenance tips to avoid encountering OBDII code P0139 in my Chevrolet?
- Regular maintenance such as timely replacement of oxygen sensors, inspecting exhaust system components, and addressing any engine performance issues promptly can help prevent the occurrence of code P0139 in your Chevrolet.
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