P0139low severityPowertrain
O2 Sensor Circuit Slow Response Bank 1 Sensor 2
on 2018 Lincoln MKX 2.7L EcoBoost V6 · AWD
What this code means
The downstream O2 sensor on Bank 1 is responding too slowly.
Symptoms
- Check Engine Light
- Failed emissions
Common causes
- Aging sensor
- Contaminated sensor
- Catalyst issue
Diagnostic steps
- Monitor sensor response
- Check catalyst efficiency
Repair notes
Replace downstream O2 sensor.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1