P1148high severityPowertrain
Closed Loop Control Function Bank 1
on 2016 Infiniti Q70L 3.7L V6 · RWD
What this code means
Fuel system cannot enter closed-loop on Bank 1 for real-time fuel trim.
Symptoms
- CEL
- Poor economy
- Rough idle
- Hesitation
- Power loss
- Hard hot-start
Common causes
- Faulty A/F sensor
- Contaminated sensor
- Damaged wiring
- Exhaust leak
- Vacuum leak
Diagnostic steps
- Test A/F sensor
- Check for leaks
- Inspect wiring
- Monitor fuel trims
Repair notes
Replace A/F ratio sensor Bank 1.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1