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P0138 2000 Ford F150 Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Quick Answer

The P0138 diagnostic trouble code (DTC) for a 2000 Ford F150 indicates an issue with the O2 sensor circuit high voltage in Bank 1 Sensor 2. Common causes include Faulty O2 sensor, Damaged wiring or connectors in the sensor circuit, ECM malfunction. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0138 2000 Ford F150 indicates O2 Sensor Circuit High Voltage Bank 1 Sensor 2.
Common causes
Common causes include Faulty O2 sensor, Damaged wiring or connectors in the sensor circuit, ECM malfunction.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code P0138 2000 Ford F150 Description

The P0138 diagnostic trouble code (DTC) for a 2000 Ford F150 indicates an issue with the O2 sensor circuit high voltage in Bank 1 Sensor 2. This sensor is responsible for monitoring the oxygen levels in the exhaust gases after they have passed through the catalytic converter. The O2 sensor provides feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion efficiency.

OBDII Code P0138 2000 Ford F150 - O2 Sensor Circuit High Voltage Bank 1 Sensor 2
P0138 2000 Ford F150 Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Common Causes of P0138 2000 Ford F150

  1. Faulty O2 sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. ECM malfunction
  4. Exhaust leaks near the sensor
  5. Contaminated sensor due to oil or coolant leaks

Symptoms of P0138 2000 Ford F150

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Engine misfires
  4. Check Engine Light illuminated on the dashboard
  5. Increased emissions

How to Fix P0138 2000 Ford F150

  1. Use an OBD-II scanner to confirm the P0138 code and identify the specific O2 sensor causing the issue.
  2. Inspect the wiring and connectors in the sensor circuit for any damage or corrosion. Repair or replace as needed.
  3. Replace the Bank 1 Sensor 2 O2 sensor with a new, high-quality sensor compatible with your Ford F150.
  4. Clear the DTC with the OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying ECM issues or exhaust system leaks.

Cost to Fix P0138 2000 Ford F150

The typical repair costs for addressing a P0138 code in a 2000 Ford F150 can range from $150 to $300, including parts and labor. However, it's essential to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate before proceeding with the repair.

What does this mean?

Tech Notes for P0138 2000 Ford F150

Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.

The HO2S Sensor Signals are monitored for an over voltage fault. The code is set when HO2S signal voltage is 1.5 volts or greater.

When is the Code Detected?

The P0138 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor signal voltage remains excessively high for an extended period of time.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0138 2000 Ford F150 Code

1. What are the common symptoms of OBDII code P0138 for a 2000 Ford F150?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.

2. What does the OBDII code P0138 indicate for a 2000 Ford F150?

- The code P0138 indicates a high voltage condition in the O2 Sensor Circuit for Bank 1 Sensor 2 in the exhaust system of the vehicle.

3. What are the possible causes of OBDII code P0138 in a 2000 Ford F150?

- Possible causes include a faulty O2 sensor, wiring issues in the O2 sensor circuit, exhaust leaks, engine misfires, or a problem with the engine control module.

4. How can I diagnose the O2 Sensor Circuit High Voltage issue in a 2000 Ford F150?

- You can use a scan tool to read the OBDII code P0138, visually inspect the O2 sensor and its wiring for any damage, and perform voltage tests to determine the exact cause of the high voltage condition.

5. Can I drive my 2000 Ford F150 with OBDII code P0138?

- It is not recommended to drive the vehicle for an extended period with the code P0138 as it can lead to poor engine performance and potential damage to the catalytic converter.

6. How can I repair OBDII code P0138 in my 2000 Ford F150?

- The repair typically involves replacing the Bank 1 Sensor 2 O2 sensor, repairing any damaged wiring, fixing exhaust leaks, and clearing the code with a scan tool.

7. What are some tips to prevent O2 sensor circuit high voltage issues in a 2000 Ford F150?

- Regular maintenance, such as replacing O2 sensors at recommended intervals, checking for exhaust leaks, and ensuring proper engine performance, can help prevent OBDII code P0138.

8. Can a DIY enthusiast fix OBDII code P0138 in a 2000 Ford F150?

- Depending on your level of expertise, you may be able to replace the O2 sensor or check for visible wiring issues, but more complex diagnostics and repairs may require professional assistance.

9. How long does it take to repair OBDII code P0138 for a 2000 Ford F150?

- The repair time can vary based on the exact cause of the issue, but replacing the O2 sensor or fixing wiring problems typically takes around 1-2 hours.

10. Will resetting the Check Engine Light resolve OBDII code P0138 in a 2000 Ford F150?

- Resetting the Check Engine Light may temporarily turn it off, but the underlying issue causing OBDII code P0138 will remain unresolved, leading to the light coming back on.

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