p1148
Moderate
Infiniti · SUVs
Closed Loop Fueling Not Achieved (Bank 2)
Quick Answer
Error code P1148 on your Infiniti SUVs means: Closed Loop Fueling Not Achieved (Bank 2). This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Check oxygen sensor heater circuit
2
Measure fuel pressure at fuel rail
3
Inspect for intake vacuum leaks
4
Test fuel injector pulse width
5
Replace oxygen sensor if needed
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Oxygen sensor
Fuel pressure gauge
Vacuum hose
Fuel injector cleaner
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