O2 Sensor Circuit Low Voltage Bank 1 Sensor 1
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 p0131 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The upstream O2 sensor voltage on Bank 1 is staying below 0.45V, indicating a lean condition or sensor fault.
Symptoms
- Check Engine Light
- Lean running
- Poor fuel economy
- Rough idle
Common Causes
- Vacuum leak
- Faulty O2 sensor
- Exhaust leak before sensor
- Low fuel pressure
- Faulty fuel injector
Diagnostic Steps
- Check for vacuum leaks
- Monitor O2 sensor voltage
- Test fuel pressure
- Perform smoke test on intake
- Inspect O2 sensor
Repair Notes
Fix vacuum or exhaust leak. Replace O2 sensor if confirmed faulty.
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
P0131 on Other Vehicles
Common Questions
What does code P0131 mean on a 2016-2016 Ford Explorer?
P0131 stands for "O2 Sensor Circuit Low Voltage Bank 1 Sensor 1". The upstream O2 sensor voltage on Bank 1 is staying below 0.45V, indicating a lean condition or sensor fault.
What are the symptoms of P0131 on a Ford Explorer?
Common symptoms of P0131 include: Check Engine Light, Lean running, Poor fuel economy, Rough idle.
What causes P0131 on a 2016-2016 Ford Explorer?
Common causes of P0131 include: Vacuum leak, Faulty O2 sensor, Exhaust leak before sensor, Low fuel pressure, Faulty fuel injector.
Last updated: March 2026
View Labor Times | View Torque Specs | View Fluid Specs | View Battery Specs