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Engine-Codes – Ford – P0138 2001 Ford F150

P0138 2001 Ford F150 Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Quick Answer

The P0138 code for a 2001 Ford F150 indicates an issue with the O2 sensor circuit high voltage for Bank 1 Sensor 2. Common causes include Faulty O2 sensor, Damaged wiring or connectors in the sensor circuit, Exhaust leaks near the sensor. 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 2001 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, Exhaust leaks near the sensor.
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 2001 Ford F150 Description

The P0138 code for a 2001 Ford F150 indicates an issue with the O2 sensor circuit high voltage for Bank 1 Sensor 2. The O2 sensor, also known as the oxygen sensor, plays a crucial role in monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. Bank 1 Sensor 2 specifically refers to the downstream O2 sensor located after the catalytic converter on the side of the engine with cylinder 1.

OBDII Code P0138 2001 Ford F150 - O2 Sensor Circuit High Voltage Bank 1 Sensor 2
P0138 2001 Ford F150 Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Common Causes of P0138 2001 Ford F150

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

Symptoms of P0138 2001 Ford F150

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

How to Fix P0138 2001 Ford F150

  1. Use an OBD-II scanner to confirm the P0138 code and pinpoint the exact issue.
  2. Inspect the O2 sensor wiring and connectors for damage or corrosion.
  3. Test the O2 sensor's voltage output using a multimeter to determine if it is functioning properly.
  4. Replace the O2 sensor if it is faulty, ensuring the new sensor is compatible with the vehicle.
  5. Clear the trouble code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0138 2001 Ford F150

The typical repair costs for addressing a P0138 code on a 2001 Ford F150 can range from $150 to $300, including parts and labor. However, 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. It's recommended to check local rates for a more accurate estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

What does this mean?

Tech Notes for P0138 2001 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 2001 Ford F150 Code

1. What are the common symptoms of OBDII code P0138 on a 2001 Ford F150?

- Common symptoms include decreased fuel efficiency, rough idling, engine misfires, and the illumination of the Check Engine light.

2. What does the OBDII code P0138 for a 2001 Ford F150 mean?

- The code indicates a high voltage condition in the O2 sensor circuit for Bank 1 Sensor 2, which is the downstream sensor on the same side as the #1 cylinder.

3. What are the possible causes of O2 sensor circuit high voltage in Bank 1 Sensor 2 on a 2001 Ford F150?

- Common causes include a faulty O2 sensor, damaged wiring or connectors, exhaust leaks near the sensor, or issues with the engine's air-fuel mixture.

4. How can I diagnose and repair OBDII code P0138 on my 2001 Ford F150?

- Start by inspecting the O2 sensor wiring and connections for any damage. Test the sensor's voltage output and replace it if necessary. Check for exhaust leaks and address any issues with the air-fuel mixture.

5. Can driving with OBDII code P0138 on a 2001 Ford F150 cause further damage?

- While driving with this code may not immediately harm the vehicle, it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time if left unresolved.

6. Do I need special tools to fix O2 sensor circuit high voltage in Bank 1 Sensor 2 on my 2001 Ford F150?

- Basic tools such as a multimeter, O2 sensor socket, and a vehicle jack may be required to diagnose and repair this issue. Specialized tools may be needed for more advanced troubleshooting.

7. Can I reset the Check Engine light after fixing OBDII code P0138 on my 2001 Ford F150?

- Yes, you can reset the Check Engine light using an OBDII scanner or by disconnecting the car's battery for a few minutes. However, it is recommended to confirm that the issue has been resolved before resetting the light.

8. How can I prevent O2 sensor circuit high voltage issues in the future on my 2001 Ford F150?

- Regular maintenance, such as checking and replacing O2 sensors according to the manufacturer's recommended intervals, keeping the engine properly tuned, and addressing any exhaust leaks promptly, can help prevent such issues.

9. Is it safe to continue driving my 2001 Ford F150 with OBDII code P0138 without immediate repair?

- While the vehicle may still be operable with this code, continued driving without addressing the underlying issue can lead to decreased performance and potential long-term damage to the engine and emissions system.

10. How much does it typically cost to repair O2 sensor circuit high voltage in Bank 1 Sensor 2 on a 2001 Ford F150?

- The cost of repairs can vary depending on the exact cause of the issue, but typically, replacing an O2 sensor can range from $100 to $300, while addressing wiring or other issues may require additional labor costs.

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