What does code P1148 mean on Infiniti vehicles?
The ECU detects a malfunction in closed loop fuel control for bank 1.
OBD-II Code Infiniti
P1148 — Infiniti — Closed Loop Control Bank 1 Malfunction
The ECU detects a malfunction in closed loop fuel control for bank 1.
Common symptoms
- Increased fuel consumption
Possible causes
- Faulty oxygen sensor
- air-fuel mixture out of range
Initial recommendation
Inspect oxygen sensors and verify fuel trim operation.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Infiniti code P1148 with your vehicle's actual symptoms for more complete diagnostic guidance.
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