O2 Sensor Circuit High Voltage Bank 1 Sensor 2
2016-2016 Ford Explorer 3.5L V6 EcoBoost
The 2016 Ford Explorer is equipped with a 3.5L V6 turbocharged gasoline engine. Below you'll find detailed p0138 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The downstream O2 sensor on Bank 1 is reading high voltage consistently.
Symptoms
- Check Engine Light
- Failed emissions
- May indicate catalyst failure
Common Causes
- Faulty sensor
- Catalytic converter failure
- Rich running condition
Diagnostic Steps
- Test sensor voltage
- Check catalyst efficiency
- Monitor upstream vs downstream O2 patterns
Repair Notes
Replace sensor. If catalyst failed, replace catalytic converter.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0138 on Other Vehicles
Common Questions
What does code P0138 mean on a 2016-2016 Ford Explorer?
P0138 stands for "O2 Sensor Circuit High Voltage Bank 1 Sensor 2". The downstream O2 sensor on Bank 1 is reading high voltage consistently.
What are the symptoms of P0138 on a Ford Explorer?
Common symptoms of P0138 include: Check Engine Light, Failed emissions, May indicate catalyst failure.
What causes P0138 on a 2016-2016 Ford Explorer?
Common causes of P0138 include: Faulty sensor, Catalytic converter failure, Rich running condition.
Last updated: March 2026
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