The OBD code P0139 for Honda indicates an issue with the Secondary Heated Oxygen Sensor 2 circuit.
Symptoms include the Engine Light ON, high fuel consumption, and excessive exhaust smoke.
This is commonly caused by a faulty sensor, wiring harness issues, or exhaust system failure.
It is a moderate issue that should be addressed promptly.
A possible fix involves inspecting and repairing the sensor, wiring, or exhaust system components as needed.
| 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 Honda p0139 OBD Code
The vehicle may experience issues related to the downstream oxygen sensor circuit malfunction (Honda P0139).
- With Honda OBD code P0139, the Engine Light will be ON.
- High Fuel Consumption can be noticed.
- Excessive Smoke from Exhaust may be present.
Causes of the Honda p0139 OBD Code
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Possible reasons for Honda fault code P0139 include issues with the oxygen sensor circuit.
- P0139 can be caused by a faulty Secondary Heated Oxygen Sensor 2.
- A Secondary Heated Oxygen Sensor 2 harness that is open or shorted.
- A Secondary Heated Oxygen Sensor 2 circuit with poor electrical connection.
- An exhaust system failure such as an exhaust gas leak.
Fixing Honda Error Code p0139 Step By Step
Replace faulty oxygen sensor in bank 1 sensor 2 for Honda fault code P0139.
- To fix Honda OBDII code P0139, first, review the ‘Possible Causes’ mentioned above and visually examine the corresponding wiring harness and connectors.
- Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Next, check the wiring for any shorts or opens.
- Test the oxygen sensor heater circuit for proper resistance.
- Replace the faulty oxygen sensor if necessary.
- Clear the fault codes and perform a road test to verify the repair.
Cost Of Fixing Honda p0139 Fault Code
The repair for Honda P0139 involves diagnosing and fixing the oxygen sensor circuit slow response (Bank 1 Sensor 2).
The cost to diagnose and fix a Honda OBD code P0139 typically ranges from $75 to $150, based on a labor rate of 1. 0 hour.
Factors like shop rates and complexity can affect the final cost.
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Details of the Honda p0139 OBD Code
Honda fault code P0139 relates to an oxygen sensor circuit slow response (Bank 1, Sensor 2).
OBD code P0139 for Honda vehicles indicates an issue with the Oxygen Sensor Circuit Slow Response Bank 1 Sensor 2. This code is triggered by the Engine Control Module (ECM) when it detects that the downstream oxygen sensor (sensor 2) in bank 1 is not responding quickly enough to changes in the airfuel mixture.
The downstream oxygen 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 Honda fault code P0139.
To diagnose and fix OBDII code P0139 in a Honda, start by checking the wiring harness and connectors for any damage or corrosion.
Use a voltmeter to test the oxygen sensor’s heater circuit for proper voltage.
Ensure the sensor is getting power and ground.
If the wiring looks good, the issue may lie with the oxygen sensor itself.
Consider replacing the sensor if all other components check out.
A scan tool can help monitor sensor data and confirm proper operation after repairs.
FAQ
OBD code P0139 in a Honda means an issue with the Secondary Heated Oxygen Sensor 2. Symptoms include Engine Light ON, high fuel consumption, and excessive smoke.
Common causes of OBD code P0139 in a Honda include a faulty Secondary Heated Oxygen Sensor 2, open/shorted sensor harness, poor electrical connection, or exhaust system failure.
Diagnose and fix OBD code P0139 in your Honda by checking Secondary Heated Oxygen Sensor 2 and related wiring for faults or damage.
Wrap Up
If your Honda is displaying OBD code P0139, you may experience poor fuel economy, rough idling, or a decrease in engine performance.
This code typically indicates a fault with the downstream oxygen sensor in bank 1, possibly due to a faulty sensor, wiring issue, or exhaust leak affecting sensor readings.
To address Honda OBD code P0139, start by inspecting the downstream oxygen sensor and its wiring harness for any visible damage or corrosion.
Test the sensor’s operation using a multimeter and replace it if necessary.
Check the exhaust system for leaks that could be affecting sensor performance.
