P0138 2006 Ford Fusion Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 2
Quick Answer
The heated oxygen sensor (HO2S) signals are monitored for an over voltage condition. Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection. 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 2006 Ford Fusion indicates O2 Sensor Circuit High Voltage Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection.
- 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.
Code P0138 2006 Ford Fusion Description
What are the Possible Causes of the DTC P0138 2006 Ford Fusion?
- Faulty Rear Heated Oxygen Sensor Bank 1
- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Intake air leaks
- Exhaust gas leaks
- Inappropriate fuel pressure
- Faulty fuel injectors
How to Fix the DTC P0138 2006 Ford Fusion?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0138 2006 Ford Fusion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0138 2006 Ford Fusion Code
1. What does the OBDII code P0138 mean on a 2006 Ford Fusion?
P0138 indicates that the oxygen sensor on Bank 1, Sensor 2, is reporting a voltage higher than expected, which may suggest a rich fuel mixture or sensor malfunction.
2. What are the common symptoms of code P0138 in a 2006 Ford Fusion?
Symptoms include poor fuel economy, the check engine light being illuminated, failed emissions tests, and potentially rough idling or hesitation.
3. What causes the P0138 code on a 2006 Ford Fusion?
Common causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, a malfunctioning catalytic converter, or engine running rich.
4. Which oxygen sensor is Bank 1 Sensor 2 on a 2006 Ford Fusion?
Bank 1 Sensor 2 is the oxygen sensor located downstream of the catalytic converter on the side of the engine with cylinder 1.
5. Can I drive my 2006 Ford Fusion with a P0138 code?
While the car may still be drivable, ignoring the P0138 code can lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter.
6. How can I fix the P0138 code on my 2006 Ford Fusion?
Repairs may include replacing the oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, or addressing issues with the fuel system.
7. How do I test the oxygen sensor for the P0138 code?
Use a multimeter to check the voltage output of the sensor. A consistent high voltage (above 1.2 volts) may indicate a faulty sensor or wiring issue.
8. Could a bad catalytic converter cause the P0138 code?
Yes, a failing catalytic converter can cause incorrect readings from the downstream oxygen sensor, triggering the P0138 code.
9. How much does it cost to fix the P0138 code on a 2006 Ford Fusion?
Repair costs can range from $150 to $400, depending on whether the issue is a simple oxygen sensor replacement or more extensive repairs.
10. Can a vacuum leak cause the P0138 code on a 2006 Ford Fusion?
No, a vacuum leak typically causes a lean condition, not the high voltage or rich condition associated with P0138.
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