[SOLVED] Dodge P0138 Code: Quick Fix For High O2 Sensor Circuit

The OBD code P0138 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, 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 and related wiring connections.

Repair Importance Level	6.67 (Out of 10)
Estimated Repair Time	Approximately 1.0 hour
Repair Difficulty Level	6.67 (Out of 10)

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Symptoms of the Dodge p0138 OBD Code

The Dodge P0138 fault code indicates a potential issue with the oxygen sensor circuit high voltage.

With OBD code P0138 on a Dodge, symptoms may include: Engine Light ON.
High Fuel Consumption.
Excessive Smoke from Exhaust.

Causes of the Dodge p0138 OBD Code

Possible reasons for Dodge 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 Dodge Error Code p0138 Step By Step

Replace the faulty oxygen sensor in bank 1 sensor 2 for Dodge fault code P0138.

To fix the Dodge 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 code from the vehicle’s computer using a scan tool.
After replacing the sensor or fixing any wiring issues, reset the vehicle’s ECU to ensure the code does not return.

Cost Of Fixing Dodge p0138 Fault Code

The repair for Dodge fault code P0138 typically involves replacing the oxygen sensor.

The cost to diagnose and fix a Dodge 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.

Details of the Dodge p0138 OBD Code

Dodge fault code P0138 relates to a high voltage condition in the downstream oxygen sensor.

Dodge OBD code P0138 means that the O2 sensor circuit high voltage (Bank 1, Sensor 2) has detected a high voltage condition.

This code is triggered by the Engine Control Module (ECM) based on the signal received from the downstream O2 sensor in Bank 1 of the exhaust system.

The downstream O2 sensor monitors the efficiency of the catalytic converter by measuring the oxygen content in the exhaust gases after they have passed through the converter.

A high voltage reading from this sensor can indicate a rich airfuel mixture or a faulty sensor.

Mechanic’s Tech Notes

Detailed information on diagnosing and repairing Dodge fault code P0138 related to oxygen sensor circuit high voltage.

To diagnose and fix OBDII code P0138 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 voltage output.

A healthy sensor should fluctuate between 0. 1 to 0. 9 volts when the engine is running.

If the voltage remains steady or at extremes, the sensor may be faulty.

Additionally, inspect the sensor’s wiring for any damage or corrosion.

If the sensor and wiring check out, the issue may lie with the PCM.

Consider using a scan tool to monitor live data and verify sensor readings to pinpoint the problem accurately.

FAQ

1. What are the common causes of OBD code P0138 in a Dodge vehicle?

Common causes of OBD code P0138 in a Dodge vehicle include a faulty rear heated oxygen sensor Bank 1, open/shorted sensor harness, poor electrical connection, and intake/exhaust leaks.

2. How can I diagnose and fix a P0138 fault code in my Dodge vehicle?

Diagnose P0138 by checking rear O2 sensor, wiring, and connectors for faults. Fix by inspecting and repairing damaged components or connectors.

3. Is it safe to continue driving with a P0138 fault code in a Dodge vehicle, or should

It is not safe to continue driving with a P0138 fault code in a Dodge vehicle. Address the rear heated oxygen sensor issue promptly to prevent further damage.

Wrap Up

If your Dodge is displaying OBD code P0138, you may experience poor fuel economy, rough idling, or a lack of power.

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 Dodge OBD code P0138, start by inspecting the downstream oxygen sensor and its wiring harness for any signs of damage or corrosion.

Test the sensor’s operation using a multimeter and replace it if necessary.

Ensure the exhaust system is free from leaks that could affect sensor accuracy