The OBD code P0138 for Chrysler 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 can be a faulty sensor, wiring issues, intake/exhaust leaks, fuel pressure problems, or faulty injectors.
This issue should be addressed promptly to prevent further damage.
A possible fix involves inspecting and repairing the sensor, wiring, and related components.
| 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 Chrysler p0138 OBD Code
The vehicle may experience issues related to the oxygen sensor circuit high voltage (Bank 1 Sensor 2).
- Symptoms for Chrysler OBD code P0138: Engine Light ON.
- High Fuel Consumption.
- Excessive Smoke from Exhaust.
Causes of the Chrysler p0138 OBD Code
Possible reasons for Chrysler fault code P0138 include issues with the oxygen sensor or wiring.
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- P0138 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 a poor electrical connection.
- Intake air leaks.
- Exhaust gas leaks.
- Inappropriate fuel pressure.
- Faulty fuel injectors.
Fixing Chrysler Error Code p0138 Step By Step
Replace faulty oxygen sensor in bank 1 sensor 2 for Chrysler P0138 fault code.
- To fix the Chrysler OBDII code p0138, 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 from the vehicle’s computer using a scan tool.
- Finally, test drive the vehicle to ensure the code does not return, indicating a successful repair.
Cost Of Fixing Chrysler p0138 Fault Code
The repair for Chrysler fault code P0138 typically involves replacing the oxygen sensor in the bank 1 sensor 2 location.
The cost to diagnose and fix a Chrysler OBD code P0138 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
Costs may vary based on shop rates, parts needed, and the complexity of the repair.
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Details of the Chrysler p0138 OBD Code
Chrysler fault code P0138 relates to a high voltage condition in the downstream oxygen sensor.
Code P0138 for Chrysler vehicles indicates that the O2 sensor circuit high voltage for bank 1 sensor 2 has been detected.
This means that the voltage signal from the downstream oxygen sensor after the catalytic converter is staying high for an extended period of time, indicating a rich airfuel mixture.
The component that triggers this fault code is the downstream oxygen sensor (sensor 2) located after the catalytic converter in bank 1 of the engine.
The ECM monitors the voltage signal from this sensor to determine if the catalytic converter is functioning properly and if the airfuel mixture is within specifications.
When the ECM detects a high voltage signal from the downstream oxygen sensor for an extended period, it triggers code P0138. This could be caused by issues such as a faulty oxygen sensor, a rich airfuel mixture, a vacuum leak, a fuel pressure problem, or a malfunctioning catalytic converter.
In summary, OBD code P0138 for Chrysler vehicles indicates a high voltage signal from the downstream oxygen sensor in bank 1, triggering the ECM to illuminate the check engine light.
Mechanic’s Tech Notes
Detailed information on diagnosing and repairing Chrysler fault code P0138 related to oxygen sensor circuit high voltage.
To diagnose and fix OBDII code P0138 on a Chrysler vehicle, start by using a voltmeter to test the oxygen sensor’s voltage signal.
Ensure the sensor is getting power and ground.
Check for any exhaust leaks near the sensor that could be affecting its readings.
If the sensor and wiring look good, consider replacing the oxygen sensor.
Additionally, using a scan tool to monitor live data can help pinpoint any issues with the sensor’s performance.
If the problem persists, further diagnosis of the engine’s fuel and ignition systems may be necessary.
FAQ
OBD code P0138 in a Chrysler means a fault with the Rear Heated Oxygen Sensor Bank 1. Check sensor, wiring, connectors, and related components for issues.
Common causes of OBD code P0138 in a Chrysler vehicle include a faulty rear heated oxygen sensor Bank 1, open/shorted sensor harness, poor electrical connection, and intake/exhaust leaks.
Diagnose and fix OBD code P0138 in a Chrysler: Symptoms include Engine Light ON, High Fuel Consumption, Excessive Smoke. Check Rear Heated Oxygen Sensor Bank 1 and related wiring for issues.
Wrap Up
If your Chrysler is displaying OBDII code P0138, you may experience poor fuel economy, rough idling, or a failed emissions test.
This code typically indicates a fault with the oxygen sensor bank 1 sensor 2, caused by sensor failure, wiring issues, or a faulty catalytic converter.
To address Chrysler OBDII code P0138, start by inspecting the oxygen sensor wiring and connectors for any damage or corrosion.
Test the sensor’s operation using a scan tool and replace it if necessary.
Check the exhaust system for leaks or damage that could affect sensor readings.
