What does code P1151 mean on Mazda vehicles?
The oxygen sensor signal indicates a lean air-fuel mixture on bank 2.
OBD-II Code Mazda
P1151 — Mazda — HO2S Bank 2 Sensor 1 Signal Below 0.45V (A/F Ratio Too Lean)
The oxygen sensor signal indicates a lean air-fuel mixture on bank 2.
Common symptoms
- Loss of power
- hesitation
Possible causes
- Vacuum leak
- faulty oxygen sensor
Initial recommendation
Inspect intake system for leaks and test oxygen sensor.
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.
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