The OBD code P0139 for Dodge indicates a fault with the Rear Heated Oxygen Sensor Bank 1. Symptoms include the Engine Light ON, high fuel consumption, and excessive exhaust smoke.
Causes may include a faulty sensor, wiring issues, fuel pressure problems, or intake/exhaust leaks.
This issue should be addressed promptly to prevent further damage.
A possible fix involves inspecting and repairing the sensor, wiring harness, and connectors for any damage or poor connections.
Repair Importance Level | 6.67 (Out of 10) |
Estimated Repair Time | Approximately 1.0 hour |
Repair Difficulty Level | 6.67 (Out of 10) |
Symptoms of the Dodge p0139 OBD Code
The Dodge P0139 fault code indicates an issue with the oxygen sensor circuit slow response.
- Symptoms for Dodge OBD code P0139 include: Engine Light ON.
- High Fuel Consumption.
- Excessive Smoke from Exhaust.
Causes of the Dodge p0139 OBD Code
Possible reasons for Dodge fault code P0139 include issues with the oxygen sensor or its wiring.
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- P0139 can be caused by a Faulty Rear Heated Oxygen Sensor Bank 1.
- A Rear Heated Oxygen Sensor Bank 1 harness that is open or shorted.
- A Rear Heated Oxygen Sensor Bank 1 circuit with poor electrical connection.
- Inappropriate fuel pressure.
- Faulty fuel injectors.
- Intake air leaks that may be faulty.
- Exhaust gas leaks.
Fixing Dodge Error Code p0139 Step By Step
Replace the faulty oxygen sensor in bank 1 sensor 2 for Dodge fault code P0139.
- To fix the Dodge OBDII code P0139, start by reviewing the possible causes mentioned above.
- Visually examine the wiring harness and connectors related to the downstream oxygen sensor.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- If no issues are found with the wiring and connectors, consider replacing the downstream oxygen sensor.
- Clear the fault codes after the repair is completed.
Cost Of Fixing Dodge p0139 Fault Code
Diagnosing and repairing Dodge code P0139 typically involves testing and replacing the oxygen sensor.
The cost to diagnose and fix a Dodge OBD code P0139 typically ranges from $75 to $150 per hour for labor rates.
With an estimated repair time of 1. 0 hour, the total cost can be around $75 to $150, depending on shop rates and the complexity of the issue.
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Details of the Dodge p0139 OBD Code
Dodge fault code P0139 relates to oxygen sensor slow response in bank 1 sensor 2.
Dodge OBD code P0139 means that the O2 sensor circuit slow response for bank 1 sensor 2. This code is triggered by the Engine Control Module (ECM) when the downstream O2 sensor takes too long to respond to changes in the airfuel mixture.
The downstream O2 sensor monitors the efficiency of the catalytic converter by measuring the oxygen levels in the exhaust after it has passed through the converter.
If the sensor response is slow, it can indicate a problem with the sensor itself, the wiring, or the catalytic converter.
Mechanic’s Tech Notes
This section provides detailed information on diagnosing and fixing Dodge fault code P0139.
To diagnose and fix OBDII code P0139 on a Dodge, start by checking the wiring harness and connectors related to the downstream oxygen sensor (Bank 1 Sensor 2).
Use a voltmeter to test the sensor’s heater circuit for proper voltage and resistance.
Inspect the connector pins for any damage, corrosion, or poor connections.
If the wiring and connectors look good, the issue may lie with the sensor itself.
Consider replacing the downstream oxygen sensor to resolve the P0139 fault code.
Remember to clear the code after making any repairs to see if it returns during a test drive.
FAQ
OBD code P0139 in a Dodge indicates an issue with the rear heated oxygen sensor Bank 1. Check sensor, wiring, fuel system, and intake/exhaust for faults.
Common symptoms for P0139 in a Dodge include Engine Light ON, high fuel consumption, and excessive exhaust smoke. Causes may include a faulty rear oxygen sensor. Fix: Check wiring and connectors.
Diagnose and repair OBD code P0139 in Dodge: Symptoms Engine Light ON, High Fuel Consumption, Excessive Smoke; Causes Faulty Rear O2 Sensor, Wiring Issues; Fix Inspect wiring and connectors.

Wrap Up
If your Dodge is displaying OBD code P0139, you may experience poor fuel economy, rough idling, or a lack of power.
This code typically indicates a fault with the oxygen sensor bank 1 sensor 2, caused by a faulty sensor, wiring issues, or an exhaust leak near the sensor.
To address Dodge OBD code P0139, start by inspecting the wiring harness for any damage or corrosion.
Test the oxygen sensor’s connectors for proper connection and continuity.
If no issues are found, consider replacing the oxygen sensor bank 1 sensor 2 to resolve the fault.
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