P1148
Closed Loop Control Function Bank 1
2011-2012 Infiniti G25 2.5L V6
High SeverityPowertrain
Description
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
- 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
P1148 on Other Vehicles
Common Questions
What does code P1148 mean on a 2011-2012 Infiniti G25?
P1148 stands for "Closed Loop Control Function Bank 1". Fuel system cannot enter closed-loop on Bank 1 for real-time fuel trim.
What are the symptoms of P1148 on a Infiniti G25?
Common symptoms of P1148 include: CEL, Poor economy, Rough idle, Hesitation, Power loss, Hard hot-start.
What causes P1148 on a 2011-2012 Infiniti G25?
Common causes of P1148 include: Faulty A/F sensor, Contaminated sensor, Damaged wiring, Exhaust leak, Vacuum leak.