P0138 1999 Ford F150 Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 2
Quick Answer
The P0138 code for a 1999 Ford F150 indicates a problem with the O2 sensor circuit high voltage for Bank 1 Sensor 2. Common causes include Faulty O2 sensor, Wiring or connector issues in the O2 sensor circuit, Exhaust leaks. 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 1999 Ford F150 indicates O2 Sensor Circuit High Voltage Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty O2 sensor, Wiring or connector issues in the O2 sensor circuit, Exhaust leaks.
- 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.
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Code P0138 1999 Ford F150 Description
The P0138 code for a 1999 Ford F150 indicates a problem with the O2 sensor circuit high voltage for Bank 1 Sensor 2. The O2 sensor, also known as the oxygen sensor, measures the oxygen levels in the exhaust gases and sends this information to the engine control module (ECM). The ECM uses this data to adjust the air-fuel mixture for optimal combustion. Bank 1 Sensor 2 specifically refers to the downstream O2 sensor on the side of the engine where cylinder 1 is located.
Common Causes of P0138 1999 Ford F150
- Faulty O2 sensor
- Wiring or connector issues in the O2 sensor circuit
- Exhaust leaks
- Engine vacuum leaks
- Malfunctioning ECM
Symptoms of P0138 1999 Ford F150
- Decreased fuel efficiency
- Engine misfires
- Rough idling or stalling
- Increased emissions
- Check Engine Light illuminated
How to Fix P0138 1999 Ford F150
- Diagnose the issue using an OBD-II scanner to confirm the P0138 code.
- Inspect the O2 sensor and its wiring for any damage or corrosion.
- Test the O2 sensor's voltage output to determine if it is functioning correctly.
- Replace the O2 sensor if it is found to be faulty.
- Clear the trouble code and test drive the vehicle to ensure the issue is resolved.
Cost to Fix P0138 1999 Ford F150
The typical repair costs for addressing a P0138 code in a 1999 Ford F150 can range from $150 to $300, including parts and labor. However, actual costs may vary based on the specific diagnosis time and labor rates at auto repair shops, which can be influenced by factors such as location, vehicle make and model, and engine type. It's recommended to inquire about local rates for a more accurate estimate.
Tech Notes for P0138 1999 Ford F150
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?
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Frequently Asked Questions about P0138 1999 Ford F150 Code
1. What are the common symptoms of OBDII code P0138 in a 1999 Ford F150?
- Common symptoms include poor fuel economy, rough idle, engine hesitation, and illuminated Check Engine light.
2. What does the OBDII code P0138 for a 1999 Ford F150 mean?
- The code indicates that the O2 sensor circuit for Bank 1 Sensor 2 is detecting a high voltage condition.
3. What are the possible causes of OBDII code P0138 in a 1999 Ford F150?
- Possible causes include a faulty O2 sensor, wiring issues in the O2 sensor circuit, exhaust leaks, or an engine running rich condition.
4. How can I diagnose the O2 sensor circuit high voltage issue in a 1999 Ford F150?
- Diagnosing involves checking the O2 sensor's wiring and connections, testing the sensor's voltage output, and inspecting the exhaust system for leaks.
5. Can a dirty or contaminated O2 sensor cause code P0138 in a 1999 Ford F150?
- Yes, a dirty or contaminated O2 sensor can cause incorrect voltage readings, triggering the P0138 code.
6. What are some repair tips for fixing OBDII code P0138 in a 1999 Ford F150?
- Repair tips include cleaning or replacing the O2 sensor, repairing any damaged wiring, fixing exhaust leaks, and addressing any underlying engine issues.
7. Is it safe to continue driving a 1999 Ford F150 with OBDII code P0138?
- It is not recommended to drive with code P0138 as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.
8. How much does it typically cost to repair OBDII code P0138 in a 1999 Ford F150?
- The cost of repairs can vary depending on the exact cause, but it may range from $100 to $300 for parts and labor.
9. Can I reset the Check Engine light after fixing OBDII code P0138 in a 1999 Ford F150?
- Yes, the Check Engine light can be reset using an OBDII scanner after the issue causing code P0138 has been resolved.
10. Will fixing OBDII code P0138 improve the overall performance of a 1999 Ford F150?
- Yes, addressing code P0138 can improve fuel efficiency, engine performance, and emissions output in the vehicle.
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