P1138 Ford Code - Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich
Quick Answer
The P1138 Ford diagnostic trouble code indicates a lack of heated oxygen sensor switches on Bank 1 Sensor 2, which is indicating a rich air-fuel mixture. Common causes include Faulty heated oxygen sensor (Bank 1 Sensor 2), Wiring or connector issues in the oxygen sensor circuit, Exhaust system leaks before the sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1138 Ford indicates Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich.
- Common causes
- Common causes include Faulty heated oxygen sensor (Bank 1 Sensor 2), Wiring or connector issues in the oxygen sensor circuit, Exhaust system leaks before the sensor.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P1138 Ford Description
The P1138 Ford diagnostic trouble code indicates a lack of heated oxygen sensor switches on Bank 1 Sensor 2, which is indicating a rich air-fuel mixture. The heated oxygen sensor, also known as the downstream oxygen sensor, is responsible for monitoring the exhaust gases after they have passed through the catalytic converter. This sensor helps the engine control module (ECM) adjust the air-fuel mixture to ensure optimal combustion and reduce harmful emissions.
Common Causes of P1138 Ford
- Faulty heated oxygen sensor (Bank 1 Sensor 2)
- Wiring or connector issues in the oxygen sensor circuit
- Exhaust system leaks before the sensor
- Engine running too rich due to another underlying issue
- ECM software or hardware problems
Symptoms of P1138 Ford
- Decreased fuel efficiency
- Check Engine Light illuminated
- Rough idling or stalling
- Poor engine performance
- Strong fuel smell from the exhaust
How to Fix P1138 Ford
- Diagnose the issue using a scan tool to verify the P1138 code and pinpoint the exact cause.
- Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
- Test the heated oxygen sensor to ensure it is functioning properly, replacing it if faulty.
- Check for exhaust leaks and repair them to prevent false readings from the sensor.
- Clear the code and perform a test drive to verify that the issue has been resolved.
Cost to Fix P1138 Ford
The cost of repairing a P1138 Ford code can vary depending on the specific cause of the issue. On average, replacing a heated oxygen sensor can cost between $100 and $300, including parts and labor. However, if additional repairs or diagnostic work are needed, the total cost could be higher. It's recommended to consult with a trusted auto repair shop for an accurate estimate based on your vehicle's make and model. Keep in mind that labor rates can vary, so it's important to inquire about pricing before proceeding with the repair.
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Information for Specific Ford Models
- P1138 1997 Ford F150 — Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich
- P1138 1998 Ford F150 — Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich
- P1138 1999 Ford F150 — Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich
- P1138 2000 Ford F150 — Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich
- P1138 2001 Ford F150 — Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich
- P1138 2002 Ford F150 — Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich
- P1138 2003 Ford F150 — Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich
Frequently Asked Questions about P1138 Ford Code
1. What are common symptoms of OBDII code P1138 in a Ford vehicle?
- Common symptoms include decreased fuel efficiency, rough idling, engine misfires, and the illumination of the check engine light.
2. What does the OBDII code P1138 'Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich' mean in a Ford?
- This code indicates that the heated oxygen sensor for bank 1 sensor 2 is detecting a rich air-fuel mixture in the exhaust.
3. What are possible causes of OBDII code P1138 in a Ford?
- Possible causes include a faulty oxygen sensor, issues with the fuel system, vacuum leaks, exhaust leaks, or a malfunctioning engine coolant temperature sensor.
4. How can I diagnose the cause of OBDII code P1138 in my Ford?
- Diagnosing this code may involve checking the oxygen sensor's operation, inspecting for leaks in the exhaust system, testing the fuel system components, and scanning for other related trouble codes.
5. Can driving with OBDII code P1138 in a Ford cause further damage?
- Driving with this code may lead to decreased fuel efficiency and potential damage to the catalytic converter over time if not addressed promptly.
6. How can I repair OBDII code P1138 in a Ford?
- Repair options may include replacing the faulty oxygen sensor, fixing any leaks in the exhaust system, addressing issues with the fuel system, or repairing faulty engine sensors.
7. Is it safe to continue driving my Ford with OBDII code P1138 present?
- It is generally not recommended to continue driving with this code as it can affect the vehicle's performance and fuel efficiency. It's best to address the issue promptly.
8. Can I reset OBDII code P1138 in my Ford without fixing the underlying issue?
- While you can clear the code with an OBDII scanner, it will likely reappear if the underlying issue is not resolved. It's important to address the root cause of the problem.
9. How much does it typically cost to repair OBDII code P1138 in a Ford?
- The cost of repairs can vary depending on the specific issue causing the code. Costs may include parts and labor for replacing sensors, fixing leaks, or addressing fuel system problems.
10. Can a DIY enthusiast fix OBDII code P1138 in a Ford?
- Depending on the skill level and experience of the DIY enthusiast, some repairs related to this code, such as replacing an oxygen sensor, may be feasible. However, more complex issues may require professional assistance.
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